From OB485a:
"Applicants must submit an Application to Change Conditions, Extend my Stay or Remain in Canada as a Worker [IMM 5710], indicating that they are applying for an Open Work Permit.
WP applications received after the effective date that make no mention of requesting an “open” WP should be processed based on the services being requested. For example, if the applicant has submitted a WP application with an LMO, the processing office is to issue the WP, restricted to the employer outlined on the LMO, assuming normal entitlements."
So if you did indeed request an open work permit type, and indicated why you are eligible for an open work permit (i.e. a PR applicant with an AOR) then they should issue you the open permit, regardless of any superfluous employer information you may have put in.