fix beam current PVs being NaN as string

Author: rerpha

app/components/TargetStation.tsx

@@ -8,7 +8,7 @@ export default function TargetStation({
 }: {
   name: string;
   instruments: Array<instListEntryWithRunstatePVandValue>;
-  beamCurrent: number | null | undefined;
+  beamCurrent: number| string | null | undefined;
 }) {
   instruments = instruments.sort((instrumenta, instrumentb) =>
     instrumenta.name.localeCompare(instrumentb.name),
@@ -17,7 +17,7 @@ export default function TargetStation({
     <div className="flex flex-col justify-center items-start w-full">
       <h1 className="w-full text-left text-gray-600 dark:text-gray-200 font-semibold text-md mt-2 py-2 ">
         {name}{" "}
-        {beamCurrent !== undefined && beamCurrent !== null
+        {beamCurrent !== undefined && beamCurrent !== null && typeof beamCurrent !== 'string'
           ? "- " + beamCurrent.toFixed(2) + " μA"
           : ""}
       </h1>