fix(headerBarView): check for null in getTextBounds

In Android <= 4.3, getBoundingClientRect does not return a rect for a
text node, closes #1377.

Author: Adam Bradley

js/views/headerBarView.js

@@ -43,7 +43,10 @@
 
           childSize = null;
           if(c.nodeType == 3) {
-            childSize = ionic.DomUtil.getTextBounds(c).width;
+            var bounds = ionic.DomUtil.getTextBounds(c);
+            if(bounds) {
+              childSize = bounds.width;
+            }
           } else if(c.nodeType == 1) {
             childSize = c.offsetWidth;
           }