def diffs_of_interest
      files_of_interest.map do |file|
        diff = EmptyDiff.new
        begin
          diff = git.diff_for_file(file)
        rescue NoMethodError
          log_unable_to_find_diff(file.inspect)
        end
        diff
      end
    end
def diffs_of_interest
      files_of_interest.map do |file|
        diff = EmptyDiff.new
        begin
          diff = git.diff_for_file(file)
        rescue NoMethodError
          log_unable_to_find_diff(file.inspect)
        end
        diff
      end
    end
for whatever reason nils/false weird things creep
 into the files_of_interest. We have to make sure to only
 try to look up diffs for actual filepaths (strings)