Edit function: create y-axis title scatter plot

Move creation of the combined names + symbols array to the if/else
block

public/js/src_modules/chartScatterPlot.mjs

@@ -106,11 +106,6 @@ const createYAxisTitleTextScatterPlot = function (
   // y-axis phenomenon symbols start at array index 1
   const unitOfMeasurementSymbolsYAxisArr = unitOfMeasurementSymbolsArr.slice(1);
 
-  const combinedNameSymbolArr = phenomenonNamesYAxisArr.map(
-    (phenomenonNameYAxis, i) =>
-      `${phenomenonNameYAxis} [${unitOfMeasurementSymbolsYAxisArr[i]}]`
-  );
-
   // The phenomenon names and unit of measurement arrays should have equal lengths
   // Use one of the arrays for looping
   if (
@@ -120,6 +115,11 @@ const createYAxisTitleTextScatterPlot = function (
       "The phenomenon names array and unit of measurement symbols array have different lengths"
     );
   } else {
+    const combinedNameSymbolArr = phenomenonNamesYAxisArr.map(
+      (phenomenonNameYAxis, i) =>
+        `${phenomenonNameYAxis} [${unitOfMeasurementSymbolsYAxisArr[i]}]`
+    );
+
     return createCombinedTextDelimitedByComma(combinedNameSymbolArr);
   }
 };