some minor code reduction

@@ -686,14 +686,11 @@ class _GetBarState<K extends Object> extends State<GetBar>
   }
 
   Widget _getTitleText() {
-    return widget.titleText != null
-        ? widget.titleText
-        : Text(
+    return widget.titleText ??
+        Text(
           widget.title ?? "",
           style: TextStyle(
-                fontSize: 16.0,
-                color: Colors.white,
-                fontWeight: FontWeight.bold),
+              fontSize: 16.0, color: Colors.white, fontWeight: FontWeight.bold),
         );
   }
 
@@ -705,11 +702,7 @@ class _GetBarState<K extends Object> extends State<GetBar>
   }
 
   FlatButton _getMainActionButton() {
-    if (widget.mainButton != null) {
     return widget.mainButton;
-    } else {
-      return null;
-    }
   }
 }