DOC: Add docstring to ConsistencyError

src/caosdb/exceptions.py

@@ -298,6 +298,7 @@ class EntityError(TransactionError):
     server.
 
     """
+
     def __init__(self, error=None, entity=None):
         TransactionError.__init__(self)
         self.error = error
@@ -321,7 +322,7 @@ class EntityError(TransactionError):
         """Return this error message as attached by the server."""
 
         return self.error
-    
+
     @property
     def description(self):
         return self.error.description if self.error is not None else None
@@ -329,8 +330,6 @@ class EntityError(TransactionError):
     def get_code(self):
         return self.error.code if self.error is not None else None
 
-    
-
     def _repr_head(self, indent):
         if hasattr(self, 'entity') and self.entity is not None:
             return (str(type(self.entity).__name__).upper() + " (" +
@@ -346,15 +345,19 @@ class UniqueNamesError(EntityError):
 
 
 class UnqualifiedParentsError(EntityError):
-    """This entity has unqualified parents (call 'get_errors()' for a list of
-    errors of the parent entities or 'get_entities()' for a list of parent
-    entities with errors)."""
+    """This entity has unqualified parents (call 'get_errors()' for a list
+    of errors of the parent entities or 'get_entities()' for a list of
+    parent entities with errors).
+
+    """
 
 
 class UnqualifiedPropertiesError(EntityError):
-    """This entity has unqualified properties (call 'get_errors()' for a list
-    of errors of the properties or 'get_entities()' for a list of properties
-    with errors)."""
+    """This entity has unqualified properties (call 'get_errors()' for a
+    list of errors of the properties or 'get_entities()' for a list of
+    properties with errors).
+
+    """
 
 
 class EntityDoesNotExistError(EntityError):
@@ -366,11 +369,12 @@ class EntityHasNoDatatypeError(EntityError):
 
 
 class ConsistencyError(EntityError):
-    pass
+    """The transaction violates database consistecy."""
 
 
 class AuthorizationException(EntityError):
     """You are not allowed to do what ever you tried to do.
 
     Maybe you need more privileges or a user account at all.
+
     """