Merge pull request #1692 from ThomasWaldmann/placeholder-for-integrityerror

IntegrityError: add placeholder for message, fixes #1572

borg/helpers.py

@@ -64,7 +64,7 @@ class ErrorWithTraceback(Error):
 
 
 class IntegrityError(ErrorWithTraceback):
-    """Data integrity error"""
+    """Data integrity error: {}"""
 
 
 class ExtensionModuleError(Error):