Store Image generates an exception if imageName is not specified

[rmthurman]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Deploy as is and do not specify an imageName

Any log messages given by the failure

Web Api skill response contains errors: 'Web Api response contains both data and errors. Will not process Data.;image-store - Error processing the request record : System.Collections.Generic.KeyNotFoundException: The given key 'imageName' was not present in the dictionary.
at System.Collections.Generic.Dictionary2.get_Item(TKey key) at AzureCognitiveSearch.PowerSkills.Vision.ImageStore.ImageStore.<>c__DisplayClass3_0.<<RunStoreImage>b__0>d.MoveNext() in C:\home\site\repository\Vision\ImageStore\ImageStore.cs:line 52 --- End of stack trace from previous location where exception was thrown --- at AzureCognitiveSearch.PowerSkills.Common.WebApiSkillHelpers.ProcessRequestRecordsAsync(String functionName, IEnumerable1 requestRecords, Func`3 processRecord) in C:\home\site\repository\Common\WebAPISkillHelper.cs:line 67'.

Expected/desired behavior

should generate a GUID and succeed

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

Mention any other details that might be useful

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