fixed MIGRATE function when key is array (#2184)

* fix: 2163 push empty string as arg

* fix: updated migrate test with keys array

Author: StefanCenusa

packages/client/lib/commands/MIGRATE.spec.ts

@@ -13,7 +13,7 @@ describe('MIGRATE', () => {
         it('multiple keys', () => {
             assert.deepEqual(
                 transformArguments('127.0.0.1', 6379, ['1', '2'], 0, 10),
-                ['MIGRATE', '127.0.0.1', '6379', '""', '0', '10', 'KEYS', '1', '2']
+                ['MIGRATE', '127.0.0.1', '6379', '', '0', '10', 'KEYS', '1', '2']
             );
         });
 

packages/client/lib/commands/MIGRATE.ts

@@ -19,7 +19,7 @@ export function transformArguments(
         isKeyArray = Array.isArray(key);
 
     if (isKeyArray) {
-        args.push('""');
+        args.push('');
     } else {
         args.push(key);
     }