BUG: Fix have_KWStyle detection when running clang-format hook
BUG: Fix have_KWStyle detection when running clang-format hook

Check before running the hook, which will run, if available.

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