Add check to make sure target exists
#495
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rschamp
approved these changes
Mar 8, 2017
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Resolves
What Github issue does this resolve (please include link)?
Fix issue scratchfoundation/scratch-gui#186
Proposed Changes
Describe what this Pull Request does
Checks to make sure target exists before requesting the id.
Reason for Changes
Explain why these changes should be made
Fix issue scratchfoundation/scratch-gui#186
Test Coverage
Please show how you have added tests to cover your changes
Manually tested against this project which used to throw errors. id=123165971