Error when running the empty file on a list of specs ("Can't run because no spec files were found")

[scebotari66]

Hello! I have noticed an issue with running the empty file on a list of specs.

Steps to reproduce:

• start from https://github.com/scebotari66/cypress-split-example (just bumped plugin version to latest)
• run SPLIT=6 SPLIT_INDEX=5 SPEC="cypress/e2e/spec-a.cy.js" npx cypress run --spec "cypress/e2e/spec-a.cy.js"

Here is the error I am getting: