better error handling

java_tools/configuration_definition/src/main/java/com/rusefi/ConfigField.java

@@ -275,6 +275,8 @@ public class ConfigField {
             // Handle just basic division, not a full fledged eval loop
             scale = scale.substring(1, scale.length() - 1);
             String[] parts = scale.split("/");
+            if (parts.length != 2)
+                throw new IllegalArgumentException("Two parts of division expected in " + scale);
             factor = Double.parseDouble(parts[0]) / Double.parseDouble(parts[1]);
         } else {
             factor = Double.parseDouble(scale);