Filter skips lines with only single character

[genotrance]

Make a simple template file with following contents:

#? stdtmpl(subsChar='?') | standard
#proc test(): string =
#  result = "@echo off\n"

if %HOMEDRIVE% == "C:" (
  echo "I'm home"
)

a
b
c

Render it using the following nim code:

include "test.tmpl"

echo test()

nim c -r test

@echo off
if %HOMEDRIVE% == "C:" (
  echo "I'm home"

None of the lines with a single character are rendered. If you put a single space character after ), it will show up.

[genotrance]

Fix works.