David Balch 528060a1a9 MDL-57742 core_lib: Make tool_consumer_instance_guid optional
In the specification, tool_consumer_instance_guid is only listed
as recommended. However, the library was requiring it.

https://www.imsglobal.org/specs/ltiv2p0/implementation-guide#toc-42
2018-05-28 12:47:05 +08:00
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