Fix behaviour when file handles a path with tilde

Two problems here
* unchecked exception handling and erroneous assumption as to why
  an exception might fire
* although the file module expands the path, when using file_args
  the unexpanded path is passed.

Expected result: ~/path/to/file should work fine
Actual result: exception is because it doesn't find file with a message
about not being able to get the selinux context

file

@@ -139,7 +139,7 @@ def main():
 
     params = module.params
     state  = params['state']
-    path   = os.path.expanduser(params['path'])
+    params['path'] = path = os.path.expanduser(params['path'])
 
     # source is both the source of a symlink or an informational passing of the src for a template module
     # or copy module, even if this module never uses it, it is needed to key off some things