[Debugger plugin] Fix UnboundLocalError: variable tensor_shape refere…

[cfroehli]

…nced before assigment

Seems the wrong variable name was used on line 99 (console filled with exception message and debugger gui doesnt update some values while debugging due to the early bail-out)

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[cfroehli]

I signed it!

[googlebot]

CLAs look good, thanks!

[caisq]

Thanks, @cfroehli