Tool silently dropping properties from dictionaries

[billschereriii]

Without access to collection schemas, links to them are not created properly (reasonable) but no error message is generated to alert the user that these properties are being skipped (which seems wrong). While the situation is clearly user error, a warning message seems necessary.

The specific case where this was observed was in building a dictionary for NetworkAdapter. When the user first built the dictionary, no entries were generated for NetworkAdapter.NetworkPorts and NetworkAdapter.NetworkDeviceFunctions. Copying the two collection files into the directory with generate_dictionaries.py enabled them to be generated in this user's case.