Fix empty lines not being processed #916
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As described in planck-repl#661, Planck has a bug where an empty line after a backslash is not processed and so does not produce the correct output (a newline character). This was due to the fact a newline by itself appears to the REPL as an empty string. This commit detects that and processes it properly. This fixes planck-repl#661.
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As described in #661, Planck has a bug where an empty line after a backslash is not processed and so does not produce the correct output (a newline character). This was due to the fact a newline by itself appears to the REPL as an empty string. This PR detects that and processes it properly. This fixes #661.