Fixed falsey values handling in keepQuery hook

Author: Dekel

lib/common/_pluck.js

@@ -21,9 +21,9 @@ function _pluckItem (item, fieldNames) {
 
   fieldNames.forEach(fieldName => {
     const valueNotByDot = item[fieldName];
-    const value = typeof valueNotByDot !== 'undefined' ? valueNotByDot : getByDot(item, fieldName);
+    const value = valueNotByDot !== undefined ? valueNotByDot : getByDot(item, fieldName);
     if (value !== undefined) { // prevent setByDot creating nested empty objects
-      if (typeof valueNotByDot !== 'undefined') { plucked[fieldName] = value; } else { setByDot(plucked, fieldName, value); }
+      if (valueNotByDot !== undefined) { plucked[fieldName] = value; } else { setByDot(plucked, fieldName, value); }
     }
   });