espressif/common-hal/_bleio/Characteristic.c: handle empty initial value #9676
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Characteristicwas usingself->current_value == NULLto indicate that theCharacteristicwas deinit-ed. However,the
current_valuestorage in aCharacteristiccan be the NULL pointer if the Characteristic is initialized with an initial value ofNone.Change to using
self->handle = BLEIO_HANDLE_INVALIDas the deinit flag (similar to whatnordicdoes), and handle an empty initial value more carefully. For instance, don't try to allocate a zero-length chunk of heap.Tested with the HID test program in #9669. I did keyboard HID to an iPhone and it works.