Peter Hamilton cd8d66fe91 Fix a bug with attribute index handling in ModifyAttribute
This changes fixes a minor bug with proper attribute index range
checking in the server implementation of ModifyAttribute. A corner
case that previously slipped through index checking and testing
has been closed. An existing unit test has been modified to fix
this bug.

Partially implements #547
2019-12-13 15:42:20 -05:00
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