Define Project#isEmpty()

src/core/PaperScopeItem.js

@@ -38,7 +38,7 @@ var PaperScopeItem = Base.extend(Callback, /** @lends PaperScopeItem# */{
 		if (!this._scope)
 			return false;
 		var prev = this._scope[this._reference];
-		if (prev && prev != this)
+		if (prev && prev !== this)
 			prev.fire('deactivate');
 		this._scope[this._reference] = this;
 		this.fire('activate', prev);

src/item/Item.js

@@ -830,7 +830,7 @@ var Item = Base.extend(Callback, /** @lends Item# */{
 	 * no children, a {@link TextItem} with no text content and a {@link Path}
 	 * with no segments all are considered empty.
 	 *
-	 * @type Boolean
+	 * @return Boolean
 	 */
 	isEmpty: function() {
 		return !this._children || this._children.length == 0;

src/project/Project.js

@@ -92,6 +92,18 @@ var Project = PaperScopeItem.extend(/** @lends Project# */{
 		this.symbols = [];
 	},
 
+	/**
+	 * Specifies whether the project has any content or not. Note that since
+	 * projects by default are created with one empty layer, this returns alos
+	 * {@code true} if that layer exists but is itself empty.
+	 *
+	 * @return Boolean
+	 */
+	isEmpty: function() {
+		return this.layers.length <= 1
+			&& (!this.activeLayer || this.activeLayer.isEmpty());
+	},
+
 	/**
 	 * Removes this project from the {@link PaperScope#projects} list, and also
 	 * removes its view, if one was defined.