Fix Crash

[Philoul]

Hi Andy
Just took a look on your working branch to see implementation in AAPS V4.

I found a crash I can reproduce 100% of the time:

• I selected Tandem Mobi pump (of course no pump available so it was just to see the user interface)
• I clicked on Data or Actions button
• Then I click on Back button on the phone to go back to main T:Mobi Overview: Crash immediatly

On emulator and on my dev phone.

Gemini proposed me this update (feel free to use it or find a better solution...).