Dan Rubel e384c0d982 Refactor flutter command exit code - part 2 (#6817)
* convert pubGet to throw ToolExit on non-zero exit code
* convert commandValidator to throw ToolExit for non-zero exit code
* convert flutter commands to throw ToolExit for non-zero exit code
* use convenience method throwToolExit
* only show "if this problem persists" for unusual exceptions
2016-11-13 22:09:03 -05:00
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