fix a bug with chaining traceback

src/jflow/workflow.py

@@ -509,8 +509,9 @@ class Workflow(threading.Thread):
             # Format str
             pretty_str = title
             pretty_str += ("\n" + worflow_errors) if worflow_errors != "" else ""
-            pretty_str += ("\n" + status) if status != "" else ""
-            pretty_str += ("\n" + components_errors) if components_errors != "" else ""
+            if len(workflow.get_components_nameid()) > 0:
+                pretty_str += ("\n" + status) if status != "" else ""
+                pretty_str += ("\n" + components_errors) if components_errors != "" else ""
             if html: return pretty_str.replace("\n", "<br />")
             else: return pretty_str
         else:
@@ -647,20 +648,20 @@ class Workflow(threading.Thread):
                         s.starttls()
                         s.login(me, fromp)
                     except smtplib.SMTPHeloError:
-                        self._log("The server didn't reply properly to the HELO greeting.", level="debug", traceback=traceback.format_exc())
+                        self._log("The server didn't reply properly to the HELO greeting.", level="debug", traceback=traceback.format_exc(chain=False))
                     except smtplib.SMTPAuthenticationError:
-                        self._log("The server didn't accept the username/password combination.", level="debug", traceback=traceback.format_exc())
+                        self._log("The server didn't accept the username/password combination.", level="debug", traceback=traceback.format_exc(chain=False))
                     except smtplib.SMTPException:
-                        self._log("No suitable authentication method was found, or the server does not support the STARTTLS extension.", level="debug", traceback=traceback.format_exc())
+                        self._log("No suitable authentication method was found, or the server does not support the STARTTLS extension.", level="debug", traceback=traceback.format_exc(chain=False))
                     except RuntimeError:
-                        self._log("SSL/TLS support is not available to your Python interpreter.", level="debug", traceback=traceback.format_exc())
+                        self._log("SSL/TLS support is not available to your Python interpreter.", level="debug", traceback=traceback.format_exc(chain=False))
                     except:
-                        self._log("Unhandled error when sending mail.", level="debug", traceback=traceback.format_exc())
+                        self._log("Unhandled error when sending mail.", level="debug", traceback=traceback.format_exc(chain=False))
                     finally:
                         s.sendmail(me, [you], msg.as_string())
                         s.close()
                 except:
-                    self._log("Impossible to connect to smtp server '" + smtps + "'", level="debug", traceback=traceback.format_exc())
+                    self._log("Impossible to connect to smtp server '" + smtps + "'", level="debug", traceback=traceback.format_exc(chain=False))
     
     def get_parameters_per_groups(self):
         name = self.get_name()
@@ -865,7 +866,7 @@ class Workflow(threading.Thread):
                 self._serialize()
                 self._send_email()
         except Exception as e:
-            self._log(str(e), traceback=traceback.format_exc())
+            self._log(str(e), traceback=traceback.format_exc(chain=False))
             utils.display_error_message(str(e))
 
     def _update_status_from_log(self):
@@ -1068,7 +1069,7 @@ class Workflow(threading.Thread):
                     if issubclass(obj, jflow.component.Component) and obj.__name__ != jflow.component.Component.__name__:
                         pckge[class_name] = modname
             except Exception as e:
-                self._log("Component <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc())
+                self._log("Component <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc(chain=False))
         # finally import workflows shared packages
         workflows_dir = os.path.dirname(os.path.dirname(inspect.getfile(self.__class__)))
         for importer, modname, ispkg in pkgutil.iter_modules([os.path.join(workflows_dir, "components")], "workflows.components."):
@@ -1078,7 +1079,7 @@ class Workflow(threading.Thread):
                     if issubclass(obj, jflow.component.Component) and obj.__name__ != jflow.component.Component.__name__:
                         pckge[class_name] = modname
             except Exception as e:
-                self._log("Component <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc())
+                self._log("Component <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc(chain=False))
         return pckge
     
     def _import_external_components(self):
@@ -1093,7 +1094,7 @@ class Workflow(threading.Thread):
                     if issubclass(obj, jflow.extparser.ExternalParser) and obj.__name__ != jflow.extparser.ExternalParser.__name__:
                         parsers.append(obj())
             except Exception as e:
-                self._log("Parser <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc())
+                self._log("Parser <{0}> cannot be loaded: {1}".format(modname, e), level="debug", traceback=traceback.format_exc(chain=False))
         
         for parser in parsers :
             # import from pipeline components package ...