Fix line heading fix in cue config page

Author: Tim020

client/src/vue_components/show/config/cues/ScriptLineCueEditor.vue

@@ -78,7 +78,7 @@
               {{ characterGroups.find((char) => (char.id === part.character_group_id)).name }}
             </b>
           </template>
-          <b v-else>&nbsp;</b>
+          <b v-else-if="needsHeadingsAny">&nbsp;</b>
           <p
             class="viewable-line"
             :class="{'cut-line-part': linePartCuts.indexOf(part.id) !== -1}"
@@ -356,6 +356,9 @@ export default {
       }, this);
       return ret;
     },
+    needsHeadingsAny() {
+      return this.needsHeadings.some((x) => (x === true));
+    },
     needsActSceneLabel() {
       if (this.previousLine == null) {
         return true;