STYLE: Prefer explicit check to nested try/catch
STYLE: Prefer explicit check to nested try/catch

For the common case, use a conditional check rather than
a try catch.

Use try/catch for  cases, not normal control.

Kitware/ITK,thewtex/ITK,vfonov/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,Kitware/ITK,thewtex/ITK,LucasGandel/ITK,richardbeare/ITK,hjmjohnson/ITK,LucasGandel/ITK,Kitware/ITK,vfonov/ITK,Kitware/ITK,hjmjohnson/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,thewtex/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,hjmjohnson/ITK,BRAINSia/ITK,vfonov/ITK,richardbeare/ITK,LucasGandel/ITK,vfonov/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,thewtex/ITK,richardbeare/ITK,LucasGandel/ITK,LucasGandel/ITK,vfonov/ITK,richardbeare/ITK,hjmjohnson/ITK,thewtex/ITK,BRAINSia/ITK,Kitware/ITK,BRAINSia/ITK,hjmjohnson/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,vfonov/ITK,BRAINSia/ITK,BRAINSia/ITK,vfonov/ITK,BRAINSia/ITK,thewtex/ITK,vfonov/ITK,richardbeare/ITK