Display non-field errors as returned from the server

lib/helpers.dart

@@ -0,0 +1,13 @@
+/*
+ * A set of helper functions to reduce boilerplate code
+ */
+
+/*
+ * Simplify a numerical value into a string,
+ * supressing trailing zeroes
+ */
+String simpleNumberString(double number) {
+  // Ref: https://stackoverflow.com/questions/55152175/how-to-remove-trailing-zeros-using-dart
+
+  return number.toStringAsFixed(number.truncateToDouble() == number ? 0 : 1);
+}