Delete string parameters that have a length of 0

#107

src/components/parameter-schema/ParameterSchemaFormComponent.vue

@@ -191,6 +191,13 @@ function startWorkflow() {
   errorToast?.hide();
   formState.validated = true;
   formState.errorType = undefined;
+  // delete parameters that are strings and have a length of 0
+  for (const paramName of Object.keys(formState.formInput)) {
+    const param = formState.formInput[paramName];
+    if (typeof param === "string" && param?.trim().length === 0) {
+      delete formState.formInput[paramName];
+    }
+  }
   if (launchForm.value?.checkValidity()) {
     const schemaValid = validateSchema(formState.formInput);