Commit 240388e

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Do not attempt to read fixed sized result data when indicated length of that data is zero

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Original file line number	Diff line number	Diff line change
`@@ -298,6 +298,9 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_`
`298`	`298`
`299`	`299`	`sized_read_size = atoi(data_res.c_str());`
`300`	`300`	`data_res.clear();`
	`301`	`+ if (sized_read_size == 0) {`
	`302`	`+ state = at_parse_state_t::Res;`
	`303`	`+ }`
`301`	`304`	`} else if(c == '\r') {`
`302`	`305`	`state = at_parse_state_t::ResWaitLF;`
`303`	`306`	`} else if(c == '\n') {`

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