Fix existing filepath check always returning true and adding path.
Fix existing filepath check always returning true and adding path.

Stop trying to access the filePaths array as an object, thus returning
a falsey value (arrays don't have enumarable non-numerical properties)
and so always added the filePath to the filePaths array. This meant that
a template in project/ will never override the same template from a
library.

incuna/grunt-maketextfiles