Media process is crashing with NullPointer exception

Sometime, while creating thumnails list of media files in
compose MMS->attach file,  filepath may be null due to
synchronization issue.
Adding NULL check to avoid NUllPointer exception.

Change-Id: Id6cf5612a959b3ae15b44bc60dbbcbe40c624f09
CRs-Fixed: 636494
WallpaperCropper: Fix crash when set .gif as wallpaper

It returns an equivalent scaled cropBounds as true
crop bounds, then it set the rounded rect by rounding
"out" the true crop rect, this make the rounded crop
rect may out range of the original bitmap, then an error
will happen.

We change to check the rounded crop rect, if it is out
the range of original bitmap, we set the original bitmap
bounds as rounded crop bounds.

CRs-Fixed: 622582

Change-Id: I215ef2a0165adaaadb05c62dee741a8ea6926144
SignalStrength: Hotfix TD-SCDMA

These checks need to be reviewed, they're making unwarranted assumptions
about signal value formats and possible tech combos.
This appears to work for all possible scenarios I was able to test,
but the "LTE checks" shouln't be necessary at all.

Change-Id: I889e17e79ca2b1b5fcaa393741e19bef9d3f4229