fix unchecked StatusCode

Charles Leggettrequested to merge
leggett/Gaudi:dev/GPyFix into master

(from Scott Snyder)

In the clang devval build, the AthTPCnvSvc test in AthenaServices is crashing with an unchecked StatusCode. The StatusCode in question is in Bindings.py; the change here fixes the crash. Not sure why this wasn't seen before, or why it shows up only in the clang build.

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