Handle missing slotTitle cases in fields.js

Author: ivansg44

lib/utils/fields.js

@@ -187,8 +187,12 @@ export function slotNamesForTitlesMap(fields) {
   const fieldSymbolsAtIndex = fieldSymbolsAtIndexMap(fields);
   let tempObject = {};
   for (let index in fieldSymbolsAtIndex) {
-    tempObject[fieldSymbolsAtIndex[index].slotTitle] =
-      fieldSymbolsAtIndex[index].slotName;
+    const slotName = fieldSymbolsAtIndex[index].slotName;
+    let slotTitle = fieldSymbolsAtIndex[index].slotTitle;
+    // If slotTitle not specified; use slotName as slotTitle
+    slotTitle = slotTitle === undefined ? slotName : slotTitle;
+
+    tempObject[slotTitle] = slotName;
   }
   return tempObject;
 }