Fix for non existent TLR

Gauge/src/components/tlr/tlr.tsx

@@ -2,7 +2,7 @@ import { createRef, FC, useEffect } from 'react';
 import Controls from '../controls/controls';
 
 interface TLRProps {
-  content: string;
+  content?: string;
   position: number;
   page: number;
   loading: boolean;
@@ -63,7 +63,7 @@ const TLR: FC<TLRProps> = ({ content, position, page, loading, reload }) => {
       <div ref={containerRef} id="KH_FE_FPLAN" className="p2">
         <div id="TLR">
           <div>
-            <pre>{content}</pre>
+            <pre>{typeof content !== 'string' ? 'No TLR exists' : content}</pre>
           </div>
         </div>
       </div>