EmptyValue process function (#10756)

* EmptyValue process function

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

* Fix formatting

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

---------

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

server-plugins/process-resources/src/index.ts

@@ -94,6 +94,7 @@ import {
   DayFromDate,
   Divide,
   EmptyArray,
+  EmptyValue,
   ExecutionInitiator,
   ExecutionStarted,
   Filter,
@@ -680,6 +681,7 @@ export default async () => ({
     RemoveFirst,
     RemoveLast,
     EmptyArray,
+    EmptyValue,
     ExecutionInitiator,
     ExecutionStarted,
     FirstMatchValue,

server-plugins/process-resources/src/transform.ts

@@ -463,6 +463,10 @@ export async function CurrentDate (): Promise<Timestamp> {
   return Date.now()
 }
 
+export function EmptyValue (): null {
+  return null
+}
+
 export function EmptyArray (): any[] {
   return []
 }

server-plugins/process-resources/src/utils.ts

@@ -247,12 +247,12 @@ async function getFunctionValue (
     const funcImpl = control.client.getHierarchy().as(transform, serverProcess.mixin.FuncImpl)
     const f = await getResource(funcImpl.func)
     const val = await f(res, {}, control, execution)
-    if (val == null) {
+    if (val == null && context.func !== process.function.EmptyValue) {
       throw processError(process.error.EmptyFunctionResult, {}, { func: func.label })
     }
     return val
   }
-  if (res == null) {
+  if (res == null && context.func !== process.function.EmptyValue) {
     throw processError(process.error.EmptyFunctionResult, {}, { func: func.label })
   }
   return res