Remove gratuitous debug assertions

src/ol/geom/circle.js

@@ -222,8 +222,6 @@ ol.geom.Circle.prototype.setFlatCoordinates = function(layout, flatCoordinates)
  * @api
  */
 ol.geom.Circle.prototype.setRadius = function(radius) {
-  goog.DEBUG && console.assert(this.flatCoordinates,
-      'truthy this.flatCoordinates expected');
   this.flatCoordinates[this.stride] = this.flatCoordinates[0] + radius;
   this.changed();
 };

src/ol/geom/flat/flipflatgeom.js

@@ -16,8 +16,6 @@ ol.geom.flat.flip.flipXY = function(flatCoordinates, offset, end, stride, opt_de
     dest = opt_dest;
     destOffset = opt_destOffset !== undefined ? opt_destOffset : 0;
   } else {
-    goog.DEBUG && console.assert(opt_destOffset === undefined,
-        'opt_destOffSet should be defined');
     dest = [];
     destOffset = 0;
   }