Fix my merge error from the merge from remote-tracking branch 'cpascu/gridster.js/faux-rows-patch'

Author: David Morse

dist/jquery.gridster.js

@@ -4290,7 +4290,7 @@
 			this.gridmap[col] = [];
 		}
 
-		if (typeof this.gridmap[col][row] === undefined) {
+		if (typeof this.gridmap[col][row] === 'undefined') {
 			this.gridmap[col][row] = false;
 		}
 		this.faux_grid.push(coords);

dist/jquery.gridster.min.js

@@ -4290,7 +4290,7 @@
 			this.gridmap[col] = [];
 		}
 
-		if (typeof this.gridmap[col][row] === undefined) {
+		if (typeof this.gridmap[col][row] === 'undefined') {
 			this.gridmap[col][row] = false;
 		}
 		this.faux_grid.push(coords);

dist/jquery.gridster.with-extras.js

@@ -3413,7 +3413,7 @@
 			this.gridmap[col] = [];
 		}
 
-		if (typeof this.gridmap[col][row] === undefined) {
+		if (typeof this.gridmap[col][row] === 'undefined') {
 			this.gridmap[col][row] = false;
 		}
 		this.faux_grid.push(coords);