Comment 2 for bug 2043127

Added a check for this on the OPAC holds screen. If the patron's preferred pickup library is not in the dropdown, it adds a new option to the dropdown that asks them to choose a pickup library. It also disables the submit button until they do.

Branch at: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/smayo/lp2043127-Nonvisible_Preferred_Pickup_Location_Starts_OPAC_Hold_Screen_On_Different_Org