Fix i2c slave scl freeze if read address first recieved#25
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If i2c master performs discovery via address read, stm32 has no data to send for the masterin requestEvent. Send the zero byte if we got requestEvent early, for example on i2c address read.
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If i2c master performs discovery via address read after init, stm32 has no data to send for the master in
requestEventbecausereceiveEventis not fired. Send the zero byte if we got requestEvent early, for example on i2c address read.This is how it looks like when slave stalls the SCL line
