Ignore non-font resource references in TextView constructor

TextView was blowing up in its constructor when fontFamily was
set in xml to a reference that was not a font, e.g. @style/mystyle.

These values should be ignored as they are not valid, but we don't
want to crash the app for it either.

Bug: 35863153
Test: See topic
run cts -m CtsWidgetTestCases -t android.widget.cts.TextViewTest#testFontResources_setInXmlStyle

Change-Id: I5d9443e70a36122d312c3a9f2c0dcffb530dbca8