Fix any other regressions

[chfw]

• moban "{{hello}}" throw exception
• moban -t abs_ulr_to_single_template ... throws exception.
• fix moban 0.4.5 test failures on openSUSE Tumbleweed #275

[codecov-io]

Codecov Report

Merging #313 into dev will increase coverage by 0.08%.
The diff coverage is 98.71%.

@@            Coverage Diff             @@
##              dev     #313      +/-   ##
==========================================
+ Coverage   97.79%   97.88%   +0.08%     
==========================================
  Files          59       60       +1     
  Lines        2817     2889      +72     
==========================================
+ Hits         2755     2828      +73     
+ Misses         62       61       -1

Impacted Files	Coverage Δ
moban/mobanfile/templates.py	100% <ø> (ø)	⬆️
moban/file_system.py	96.87% <0%> (+0.52%)	⬆️
moban/main.py	100% <100%> (ø)	⬆️
...sts/integration_tests/test_command_line_options.py	100% <100%> (ø)	⬆️
tests/test_buffered_writer.py	100% <100%> (ø)
moban/jinja2/engine.py	100% <100%> (ø)	⬆️
moban/plugins/template.py	98.13% <100%> (+0.04%)	⬆️
moban/constants.py	100% <100%> (ø)	⬆️

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