Make sure the right scale is used for the scanner
Can't have two values with the same key...

This prevents duplicate entries from being added to the resource_info
dictionary with the same key
Prevents continuous loading in case of errors
Make sure the texture map is readable

This is an admittedly questionable way of going about it;  this
basically tests the offending texture to make sure that it be accessed
properly, if not then it skips this entry and continues to the next.