Fixed exception formatting nonexistent value

Co-authored-by: Martin Raifer <martin@raifer.tech>

modules/ui/fields/roadheight.js

@@ -175,8 +175,11 @@ export function uiFieldRoadheight(field, context) {
             } else if (primaryValue) {
                 var rawValue = primaryValue;
                 primaryValue = parseFloat(rawValue);
-                if (isNaN(primaryValue)) primaryValue = rawValue;
-                primaryValue = formatFloat(primaryValue);
+                if (isNaN(primaryValue)) {
+                    primaryValue = rawValue;
+                } else {
+                    primaryValue = formatFloat(primaryValue);
+                }
                 _isImperial = false;
             }
         }

modules/ui/fields/roadspeed.js

@@ -137,8 +137,11 @@ export function uiFieldRoadspeed(field, context) {
             }
 
             value = parseInt(value, 10);
-            if (isNaN(value)) value = rawValue;
-            value = formatFloat(value);
+            if (isNaN(value)) {
+                value = rawValue;
+            } else {
+                value = formatFloat(value);
+            }
         }
 
         setUnitSuggestions();