Display error message in custom tool editor

Author: mvdbeek

client/src/components/Tool/CustomToolEditor.vue

@@ -106,6 +106,9 @@ async function saveTool() {
 
 <template>
     <div>
+        <b-alert v-if="errorMsg" variant="danger" show dismissible>
+            {{ errorMsg }}
+        </b-alert>
         <div class="d-flex flex-gapx-1">
             <Heading h1 separator inline size="lg" class="flex-grow-1 mb-2">Tool Editor</Heading>
             <b-button variant="primary" size="m" @click="saveTool">Save</b-button>