Error: Type and number for constituent phones must be unique - when committing a constituent update batch with no phone fields

When adding new phone numbers, users are not able to add multiple phone numbers with identical type/number combinations.  However, when committing a constituent update batch with no phone fields included, for specific constituents the exception "The type and number for constituent phone must be unique" is received.  This occurs for a constituent who only has one phone number record.

Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001.65
 2.94.1524.29

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