Fisheye treats files as binary if they used to have a svn:mime-type property, even after the property has been removed

Steps to reproduce:
1. Commit a test.sql file into the repository (the source of the file can be shown up in FishEye)
2. Add the properties svn:mime-type (e.g. svn:mime-type = image/gif) to that file and commit it(now the content of the file cannot be displayed as it is a binary file)
3. Remove the properties and commit it again (the content of the file failed to show up as it is still displayed as binary file even though a full re-index of the repository is being executed)

Please see the screenshots for a clearer picture: Original, PropertiesSet, Source_PropertiesSet, PropertiesRemoved, Source_PropertiesRemoved