crash with no results

A failed start due to what looks like https://github.com/cypress-io/cypress/issues/17627 causes cypress-repeat to crash
```
10:59:15 error: Cannot read properties of undefined (reading 'filter')
10:59:15 TypeError: Cannot read properties of undefined (reading 'filter')
10:59:15 at onTestResults (/node_modules/cypress-repeat/index.js:110:14)
10:59:15 at tryCatcher (/node_modules/bluebird/js/release/util.js:16:23)
10:59:15 at Promise._settlePromiseFromHandler (/node_modules/bluebird/js/release/promise.js:547:31)
10:59:15 at Promise._settlePromise (/node_modules/bluebird/js/release/promise.js:604:18)
10:59:15 at Promise._settlePromise0 (/node_modules/bluebird/js/release/promise.js:649:10)
10:59:15 at Promise._settlePromises (/node_modules/bluebird/js/release/promise.js:729:18)
10:59:15 at Promise._fulfill (/node_modules/bluebird/js/release/promise.js:673:18)
10:59:15 at Promise._resolveCallback (/node_modules/bluebird/js/release/promise.js:466:57)
10:59:15 at Promise._settlePromiseFromHandler (/node_modules/bluebird/js/release/promise.js:559:17)
10:59:15 at Promise._settlePromise (/node_modules/bluebird/js/release/promise.js:604:18)
10:59:15 at Promise._settlePromise0 (/node_modules/bluebird/js/release/promise.js:649:10)
10:59:15 at Promise._settlePromises (/node_modules/bluebird/js/release/promise.js:729:18)
10:59:15 at Promise._fulfill (/node_modules/bluebird/js/release/promise.js:673:18)
10:59:15 at /node_modules/bluebird/js/release/nodeback.js:42:21
10:59:15 at /node_modules/cypress/node_modules/universalify/index.js:22:54
```
I guess cypress-repeat should guard against this

Start at cypress-repeat/index.js line 110 and reproduce the failed-start/no-results case described in the issue. Verify that this input no longer causes the reported TypeError and that the command completes without crashing.

Written by the indexing model from the issue text.