Please see the discussion in this thread for options.
If there is any issue with Box 15 that prevents e-filing your return with a blank Box 15, and it absolutely requires some value in the software, then either try using your Federal EIN here, or enter a "nonsense" value such as 12345 67890 (with a space in the middle, or not). If the TurboTax program asks you for a state ID number in a specific format, such as needing exactly 9-digits and ending in XYZ, for instance, then enter a just enter a value that conforms to that format . . . such as 123456XYZ. This will enable you to bypass the issue and file your return.
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