Fix possible NPE in MainKeyboardView

Change-Id: I1fc21a981d9f1740315763b5ca0c1024ece1fa4d

java/src/com/android/inputmethod/keyboard/MainKeyboardView.java

@@ -895,13 +895,16 @@ public final class MainKeyboardView extends KeyboardView implements DrawingProxy
     }
 
     private void drawLanguageOnSpacebar(final Key key, final Canvas canvas, final Paint paint) {
+        final Keyboard keyboard = getKeyboard();
+        if (keyboard == null) {
+            return;
+        }
         final int width = key.getWidth();
         final int height = key.getHeight();
         paint.setTextAlign(Align.CENTER);
         paint.setTypeface(Typeface.DEFAULT);
         paint.setTextSize(mLanguageOnSpacebarTextSize);
-        final RichInputMethodSubtype subtype = getKeyboard().mId.mSubtype;
-        final String language = layoutLanguageOnSpacebar(paint, subtype, width);
+        final String language = layoutLanguageOnSpacebar(paint, keyboard.mId.mSubtype, width);
         // Draw language text with shadow
         final float descent = paint.descent();
         final float textHeight = -paint.ascent() + descent;