Fix optional numeric column definitions for sample sheets.

It would work properly the first time but then regress on reload and resave in the form because this initialization logic wasn't taking into account optional parameter types.

Author: jmchilton

client/src/components/Workflow/Editor/Forms/FormColumnDefinition.vue

@@ -176,8 +176,19 @@ const isOptional = ref(props.value.optional ?? false);
 const defaultBoolean = ref(props.value.default_value === null ? "null" : props.value.default_value ? "true" : "false");
 const defaultString = ref(props.value.default_value || "");
 // form framework doesn't yield typed values it seems
-const defaultIntAsStr = ref(props.value.default_value ? props.value.default_value.toString() : "0");
-const defaultFloatAsStr = ref(props.value.default_value ? props.value.default_value.toString() : "0.0");
+
+function defaultNumberAsString(defaultForType: string): string {
+    if (props.value.default_value !== null && props.value.default_value !== undefined) {
+        return props.value.default_value.toString();
+    } else if (props.value.optional) {
+        return "";
+    } else {
+        return defaultForType;
+    }
+}
+
+const defaultIntAsStr = ref(defaultNumberAsString("0"));
+const defaultFloatAsStr = ref(defaultNumberAsString("0.0"));
 
 watch(isOptional, setIsOptional);
 watch(defaultIntAsStr, setDefaultByType);