Dont store empty classes or events if they are null upon change.

src/ignite-template.js

@@ -276,8 +276,13 @@ class IgniteTemplate {
             }
         }
 
+        //Remove the old value
         this.classes = this.classes.filter(cl => cl != oldValue && cl != newValue);
-        this.classes.push(newValue);
+
+        //Add the new value if its valid.
+        if (newValue !== null && newValue !== undefined) {
+            this.classes.push(newValue);
+        }
     }
 
     /**
@@ -353,7 +358,11 @@ class IgniteTemplate {
 
             //Remove the old value from the events
             this.events[eventName] = this.events[eventName].filter(ev => ev != oldValue);
-            this.events[eventName].push(newValue);
+
+            //Add the new value if it's needed
+            if (newValue !== null && newValue !== undefined) {
+                this.events[eventName].push(newValue);
+            }
         }
     }
 }

src/sheet.js

@@ -12,7 +12,8 @@ class Sheet extends IgniteElement {
             items: ["1", "2"],
             href: "www.google.com",
             name: "default content",
-            linkClick: this.onClick
+            linkClick: this.onClick1,
+            linkClick2: this.onClick2
         };
     }
 
@@ -29,15 +30,17 @@ class Sheet extends IgniteElement {
                     new html("<h3>---- begin sheet's slot ----<h3>"),
                     new slot(this),
                     new html("<h3>---- end of slot ----</h3>"),
-                    new a("I go nowhere, but you can click me ;)").on("click", this.linkClick)
+                    new a("I go nowhere, but you can click me ;)").on("click", this.linkClick).on("click", this.linkClick2)
                 )
             );
     }
 
-    onClick(event) {
-        console.log("Element was clicked!");
-        console.log("Event:");
-        console.log(event);
+    onClick1(event) {
+        console.log("Element was clicked 1!");
+    }
+
+    onClick2(event) {
+        console.log("Element was clicked 2!");
     }
 }