Handle null and undefined values of result and result.return in invocationRequest

src/Context.ts

@@ -37,7 +37,7 @@ export function CreateContextAndInputs(info: FunctionInfo, request: rpc.IInvocat
     if (httpInput) {
         context.req = new Request(httpInput);
         context.res = new Response(context.done);
-        // This is added for backwards compatability with what the host used to send to the worker
+        // This is added for backwards compatibility with what the host used to send to the worker
         context.bindingData.sys = {
             methodName: info.name,
             utcNow: (new Date()).toISOString(),

src/WorkerChannel.ts

@@ -227,10 +227,10 @@ export class WorkerChannel implements IWorkerChannel {
       response.outputData = [];
 
       try {
-        if (result) {
+        if (result != null) {
           let returnBinding = info.getReturnBinding();
           // Set results from return / context.done
-          if (result.return) {
+          if (result.return != null) {
             if (this._v1WorkerBehavior) {
               response.returnValue = toTypedData(result.return);
             } else {

test/WorkerChannelTests.ts

@@ -455,6 +455,45 @@ describe('WorkerChannel', () => {
     assertInvocationSuccess(expectedOutput, expectedReturnValue);
   });
 
+  it ('returns and serializes falsy value: ""', () => {
+    loader.getFunc.returns((context) => context.done(null, ""));
+    loader.getInfo.returns(new FunctionInfo(orchestratorBinding));
+
+    sendInvokeMessage([], getHttpTriggerDataMock());
+
+    const expectedOutput = [];
+    const expectedReturnValue = { 
+      string: ""
+    };
+    assertInvocationSuccess(expectedOutput, expectedReturnValue);
+  });
+
+  it ('returns and serializes falsy value: 0', () => {
+    loader.getFunc.returns((context) => context.done(null, 0));
+    loader.getInfo.returns(new FunctionInfo(orchestratorBinding));
+
+    sendInvokeMessage([], getHttpTriggerDataMock());
+
+    const expectedOutput = [];
+    const expectedReturnValue = { 
+      int: 0
+    };
+    assertInvocationSuccess(expectedOutput, expectedReturnValue);
+  });
+
+  it ('returns and serializes falsy value: false', () => {
+    loader.getFunc.returns((context) => context.done(null, false));
+    loader.getInfo.returns(new FunctionInfo(orchestratorBinding));
+
+    sendInvokeMessage([], getHttpTriggerDataMock());
+
+    const expectedOutput = [];
+    const expectedReturnValue = { 
+      json: "false"
+    };
+    assertInvocationSuccess(expectedOutput, expectedReturnValue)
+  });
+
   it ('returned output is ignored if http', () => {
     loader.getFunc.returns((context) => context.done(null, ["hello, seattle!", "hello, tokyo!"]));
     loader.getInfo.returns(new FunctionInfo(httpResBinding));