Fixed error when reading an iso15693 nfc tag with no blocks

[pborsutzki]

Fixed a zero allocation error when reading an iso15693 nfc tag with no additional blocks.

What's new

When reading an iso15693 nfc tag that reports zero blocks, do not try to allocate memory for reading or try to read the inexistent blocks. This works around a hard crash of the flipper when reading e.g. a FreeStyle Libre 3 tag.

Verification

Try to read an iso15693 nfc tag that just has an UID but no additional data. The flipper should not crash. Previously it crashed when trying to allocate 0 bytes through malloc in simple_array_init.

Checklist (For Reviewer)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[gornekich]

Thanks!