Fix issues on empty variable key & value and removed placeholder variables

Author: Imiss-U1025

client/packages/lowcoder/src/comps/queries/queryComp.tsx

@@ -363,7 +363,7 @@ QueryCompTmp = class extends QueryCompTmp {
     }
     if (action.type === CompActionTypes.EXECUTE_QUERY) {
       if (getReduceContext().disableUpdateState) return this;
-      if(!action.args) action.args = this.children.variables.children.variables.toJsonValue().reduce((acc, curr) => Object.assign(acc, {[curr.key as string]:curr.value}), {});
+      if(!action.args) action.args = this.children.variables.children.variables.toJsonValue().filter(kv => kv.key).reduce((acc, curr) => Object.assign(acc, {[curr.key as string]:curr.value}), {});
       action.args.$queryName = this.children.name.getView();
 
       return this.executeQuery(action);

client/packages/lowcoder/src/comps/queries/queryCompUtils.tsx

@@ -28,10 +28,9 @@ export function toQueryView(params: FunctionProperty[]) {
     variables?: any;
     timeout: InstanceType<ParamsControlType>;
   }): Promise<QueryResult> => {
-    console.log("toQueryView props", props, params);
     const { applicationId, isViewMode } = getGlobalSettings();
 
-    const mappedVariables = Object.keys(props.variables).map(key => ({key: `${props.args?.$queryName}.variables.${key}`, value: props.variables[key]}));
+    const mappedVariables = Object.keys(props.variables).filter(k => k !== "$queryName").map(key => ({key: `${props.args?.$queryName}.variables.${key}`, value: props.variables[key] || ""}));
     let request: QueryExecuteRequest = {
       path: props.applicationPath,
       params: [