Telnet rawq_getchar returns empty string

[claytonsingh]

In the telnetlib.py file, the rawq_getchar function returns an empty string (b'') when self.rawq[self.irawq] evaluates to 0. This seems to be caused by the line of code:

exscript/Exscript/protocols/telnetlib.py

Lines 574 to 576 in 9d5b035

	c = self.rawq[self.irawq]
	if not py2:
	c = c.to_bytes((c.bit_length()+7)//8, 'big')

This issue appears to be related to the conversion of an integer value of 0 to bytes, which results in an empty byte string instead of a null byte character.

Steps to Reproduce:

Call rawq_getchar when self.rawq[self.irawq] is 0.
Observe that instead of returning the expected byte value, an empty string b'' is returned.

Expected Behavior:

When self.rawq[self.irawq] is 0, the method should ideally return a representation of the null byte (b'\x00').