Fix LT-15177 (don't delete existing affix files)

* If an affix file exists when initializing a dictionary
  don't replace its contents with the default.

Change-Id: I6b252a5618967ceb76dbded7523d329e0540db71
Don't crash if audio control has no parent

 * LT-15148.

Change-Id: Ibe467f3331e99ca712d024547c1c87ada8d3aca5