Assertion fired if a duplicate tag was in the photo at import time.  This corrects the problem.
Assertion fired if a duplicate tag was in the photo at import time.  This corrects the problem.


damianmoore/shotwell,Sanva/shotwell-gsoc,abrauchli/shotwell,h4ck3rm1k3/shotwell,jimbonator/shotwell,polymeris/shotwell,abrauchli/shotwell,ritchiewilson/shotwell,jimbonator/shotwell,polymeris/shotwell,damianmoore/shotwell,jof/shotwell,Sanva/shotwell-gsoc,ritchiewilson/shotwell,h4ck3rm1k3/shotwell,jof/shotwell,abrauchli/shotwell,polymeris/shotwell,jimbonator/shotwell,jof/shotwell,ritchiewilson/shotwell,damianmoore/shotwell,Sanva/shotwell-gsoc,h4ck3rm1k3/shotwell