Merge pull request #292 from BenoitZugmeyer/fix/unexected-exception-on-mount

fix: unexpected exception on grid-layout mount

Author: gmsa

src/components/GridLayout.vue

@@ -203,7 +203,7 @@
         },
         methods: {
             layoutUpdate() {
-                if (this.layout !== undefined) {
+                if (this.layout !== undefined && this.originalLayout !== null) {
                     if (this.layout.length !== this.originalLayout.length) {
                         // console.log("### LAYOUT UPDATE!", this.layout.length, this.originalLayout.length);