Make ol.Map#setView do not accept undefined

With this change map.setView(null) is permitted, but map.setView(undefined) is not. map.getView now always returns a defined value, which may be null is setView was called with null.

src/ol/interaction/doubleclickzoominteraction.js

@@ -50,7 +50,7 @@ ol.interaction.DoubleClickZoom.prototype.handleMapBrowserEvent =
     var anchor = mapBrowserEvent.coordinate;
     var delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;
     var view = map.getView();
-    goog.asserts.assert(goog.isDef(view));
+    goog.asserts.assert(!goog.isNull(view));
     ol.interaction.Interaction.zoomByDelta(
         map, view, delta, anchor, this.duration_);
     mapBrowserEvent.preventDefault();

src/ol/interaction/draganddropinteraction.js

@@ -100,7 +100,7 @@ ol.interaction.DragAndDrop.prototype.handleResult_ = function(file, result) {
   var projection = this.reprojectTo_;
   if (goog.isNull(projection)) {
     var view = map.getView();
-    goog.asserts.assert(goog.isDef(view));
+    goog.asserts.assert(!goog.isNull(view));
     projection = view.getProjection();
     goog.asserts.assert(goog.isDef(projection));
   }

src/ol/interaction/dragzoominteraction.js

@@ -54,7 +54,7 @@ goog.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);
 ol.interaction.DragZoom.prototype.onBoxEnd = function() {
   var map = this.getMap();
   var view = map.getView();
-  goog.asserts.assert(goog.isDef(view));
+  goog.asserts.assert(!goog.isNull(view));
   var extent = this.getGeometry().getExtent();
   var center = ol.extent.getCenter(extent);
   var size = map.getSize();

src/ol/interaction/keyboardpaninteraction.js

@@ -70,7 +70,7 @@ ol.interaction.KeyboardPan.prototype.handleMapBrowserEvent =
         keyCode == goog.events.KeyCodes.UP)) {
       var map = mapBrowserEvent.map;
       var view = map.getView();
-      goog.asserts.assert(goog.isDef(view));
+      goog.asserts.assert(!goog.isNull(view));
       var viewState = view.getState();
       var mapUnitsDelta = viewState.resolution * this.pixelDelta_;
       var deltaX = 0, deltaY = 0;

src/ol/interaction/keyboardzoominteraction.js

@@ -70,7 +70,7 @@ ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
       var delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;
       map.render();
       var view = map.getView();
-      goog.asserts.assert(goog.isDef(view));
+      goog.asserts.assert(!goog.isNull(view));
       ol.interaction.Interaction.zoomByDelta(
           map, view, delta, undefined, this.duration_);
       mapBrowserEvent.preventDefault();

src/ol/interaction/mousewheelzoominteraction.js

@@ -101,7 +101,7 @@ ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
   var delta = goog.math.clamp(this.delta_, -maxDelta, maxDelta);
 
   var view = map.getView();
-  goog.asserts.assert(goog.isDef(view));
+  goog.asserts.assert(!goog.isNull(view));
 
   map.render();
   ol.interaction.Interaction.zoomByDelta(map, view, -delta, this.lastAnchor_,