Fix rules

src/jflow/rules.py

@@ -93,6 +93,7 @@ class SimpleRule (ABC):
 class LinkRule (SimpleRule):
     def __init__(self, user_args, wf_instance, src_arg, targets_args, nb_rows):
         SimpleRule.__init__(self, user_args, wf_instance, src_arg, nb_rows)
+        self.require_src = True
         self.targets_args = targets_args
 
     @abstractmethod
@@ -251,8 +252,12 @@ class AtLeastOneAmong(LinkRule):
     At least one parameter among the list must be set
     """
 
+    def __init__(self, user_args, wf_instance, src_arg, targets_args, nb_rows):
+        LinkRule.__init__(self, user_args, wf_instance, src_arg, targets_args, nb_rows)
+        self.require_src = False
+
     def check(self):
-        if self.parameter_value is None:
+        if self.parameter_value is None or not self.parameter_value:
             has_one = False
             for grp_param in self.targets_args:
                 if not getattr(self.wf_instance, grp_param).is_None:

src/jflow/workflow.py

@@ -1360,8 +1360,7 @@ class Workflow(threading.Thread):
                 validator.check()
             else:
                 raise Exception("Rule is not a conditional link rule: " + name)
-        elif (src_arg in user_args and user_args[src_arg] is not None and user_args[src_arg]) or \
-                (isinstance(getattr(self, src_arg), MultiParameterList)):
+        else:
             is_link_rule = re.match(link_rule, rule)  # Check the second special rule
             if is_link_rule:
                 # Check this special rule:
@@ -1380,12 +1379,15 @@ class Workflow(threading.Thread):
                 if issubclass(validator_class, j_rules.LinkRule):
                     # Check the rule is the same special rule
                     validator = validator_class(user_args, self, src_arg, targets, nb_rows)
-                    validator.check()
                 elif issubclass(validator_class, j_rules.ValueRule):
                     validator = validator_class(user_args, self, src_arg, is_link_rule.group(2), nb_rows)
-                    validator.check()
                 else:
                     raise Exception("Rule is not a link rule: " + name)
+
+                if (src_arg in user_args and user_args[src_arg] is not None and user_args[src_arg]) or \
+                        (isinstance(getattr(self, src_arg), MultiParameterList)) or (
+                        not validator.require_src):
+                    validator.check()
             else:  # It's a simple rule
                 name = rule