Fix loops being given empty strings.

packages/server/src/automations/tests/steps/loop.spec.ts

@@ -7,6 +7,8 @@ import {
   CreateRowStepOutputs,
   FieldType,
   FilterCondition,
+  AutomationStatus,
+  AutomationStepStatus,
 } from "@budibase/types"
 import { createAutomationBuilder } from "../utilities/AutomationTestBuilder"
 import TestConfiguration from "../../../tests/utilities/TestConfiguration"
@@ -560,5 +562,25 @@ describe("Attempt to run a basic loop automation", () => {
         status: "stopped",
       })
     })
+
+    it("should not fail if queryRows returns nothing", async () => {
+      const table = await config.api.table.save(basicTable())
+      const results = await createAutomationBuilder(config)
+        .onAppAction()
+        .queryRows({
+          tableId: table._id!,
+        })
+        .loop({
+          option: LoopStepType.ARRAY,
+          binding: "{{ steps.1.rows }}",
+        })
+        .serverLog({ text: "Message {{loop.currentItem}}" })
+        .test({ fields: {} })
+
+      expect(results.steps[1].outputs.success).toBe(true)
+      expect(results.steps[1].outputs.status).toBe(
+        AutomationStepStatus.NO_ITERATIONS
+      )
+    })
   })
 })

packages/server/src/threads/automation.ts

@@ -68,7 +68,11 @@ function getLoopIterable(step: LoopStep): any[] {
   let input = step.inputs.binding
 
   if (option === LoopStepType.ARRAY && typeof input === "string") {
-    input = JSON.parse(input)
+    if (input === "") {
+      input = []
+    } else {
+      input = JSON.parse(input)
+    }
   }
 
   if (option === LoopStepType.STRING && Array.isArray(input)) {
@@ -492,7 +496,7 @@ class Orchestrator {
       }
 
       const status =
-        iterations === 0 ? AutomationStatus.NO_CONDITION_MET : undefined
+        iterations === 0 ? AutomationStepStatus.NO_ITERATIONS : undefined
       return stepSuccess(stepToLoop, { status, iterations, items })
     })
   }