Fix delly when no variants found

snakecnv/bin/delly.py

@@ -106,7 +106,8 @@ def runDelly(args):
             completed = run(delly_filter_str, shell=True)
 
         else:
-            command =  "bcftools convert -O b -o {output}.bcf {template};\n".format(output=output, template=template)
+            command =  "bcftools convert -O b -o {output}.bcf {template};\n".format(output=os.path.splitext(output)[0],
+                                                                                    template=template)
             completed = run(command, shell=True)
 
     os.chdir(oldir)