frontend-plugin-api: allow clearing multi inputs

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/frontend-plugin-api/src/wiring/createExtension.test.ts

@@ -850,7 +850,7 @@ describe('createExtension', () => {
               return originalFactory({
                 inputs: {
                   single: [testDataRef1('single')],
-                  multi: [[testDataRef1('multi1')], [testDataRef1('multi2')]],
+                  multi: [],
                 },
               });
             },
@@ -865,7 +865,7 @@ describe('createExtension', () => {
         opt: 'none',
         single: 'single',
         singleOpt: 'none',
-        multi: 'multi1,multi2',
+        multi: '',
       });
 
       // Forward inputs directly

packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.test.tsx

@@ -426,7 +426,7 @@ describe('createExtensionBlueprint', () => {
               {
                 inputs: {
                   single: [testDataRef1('single')],
-                  multi: [[testDataRef1('multi1')], [testDataRef1('multi2')]],
+                  multi: [],
                 },
               },
             );
@@ -439,7 +439,7 @@ describe('createExtensionBlueprint', () => {
         opt: 'none',
         single: 'single',
         singleOpt: 'none',
-        multi: 'multi1,multi2',
+        multi: '',
       }),
     ]);
 

packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.ts

@@ -353,7 +353,10 @@ export function resolveInputOverrides(
           `override data provided for input '${name}' must be an array`,
         );
       }
-      if (originalInput.length !== providedData.length) {
+      if (
+        originalInput.length !== providedData.length &&
+        providedData.length > 0
+      ) {
         throw new Error(
           `override data provided for input '${name}' must match the length of the original inputs`,
         );