Small bug fix in VISTOMS system level categorization.

Former-commit-id: 0899188da1fc9dee85842132b01b26d5ecc60d34

kadmos/graph/mixin_vispack.py

@@ -630,11 +630,11 @@ class VistomsMixin(object):
                     if in_degree == 0 and out_degree > 0:
                         key = '/systemVariables/inputs' + key
                     elif in_degree > 0 and out_degree > 0:
-                        key = '/systemVariables/couplings' + key[1:]
+                        key = '/systemVariables/couplings' + key
                     elif in_degree > 0 and out_degree == 0:
-                        key = '/systemVariables/outputs' + key[1:]
+                        key = '/systemVariables/outputs' + key
                     else:
-                        key = '/systemVariables/holes' + key[1:]
+                        key = '/systemVariables/holes' + key
                     var_dict = get_element_dict(key)
                     variable_tree_categorized_system_level = merge(variable_tree_categorized_system_level, var_dict)
         logger.debug('Successfully created system level categorized variable tree.')