[BUG] Not all missing CSS files are reported

[FirePing32]

What's the error

Assume none of the CSS files are present in the directory.
if I run pytest --html=report.html --css=abc.css --css=xyz.css, It should give me error stating that abc.css and xyz.css files were not found.

Actual Output

But the current pytest version gives error for only the first CSS file abc.css and ignores xyz.css (which means it will report error for only the first --css argument if it's file is not found).

$ pytest --html=report.html --css=abc.css --css=xyz.css

    INTERNALERROR> Traceback (most recent call last):
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 253, in wrap_session
    INTERNALERROR>     config._do_configure()
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/_pytest/config/__init__.py", line 982, in _do_configure
    INTERNALERROR>     self.hook.pytest_configure.call_historic(kwargs=dict(config=self))
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 308, in call_historic
    INTERNALERROR>     res = self._hookexec(self, self.get_hookimpls(), kwargs)
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93, in _hookexec
    INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84, in <lambda>
    INTERNALERROR>     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 208, in _multicall
    INTERNALERROR>     return outcome.get_result()
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 80, in get_result
    INTERNALERROR>     raise ex[1].with_traceback(ex[2])
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187, in _multicall
    INTERNALERROR>     res = hook_impl.function(*args)
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pytest_html/plugin.py", line 92, in pytest_configure
    INTERNALERROR>     raise OSError(f"No such file or directory: '{csspath}'")
    INTERNALERROR> OSError: No such file or directory: 'abc.css'

Expected Output

You can clone and install the css-file-reporting branch of my fork here. It is a fix for this issue.
I installed the fixed version of pytest-html through pip install --editable . and it properly reports the missing CSS files.

$ pytest --html=report.html --css=abc.css --css=xyz.css

    INTERNALERROR> Traceback (most recent call last):
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 253, in wrap_session
    INTERNALERROR>     config._do_configure()
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/_pytest/config/__init__.py", line 982, in _do_configure
    INTERNALERROR>     self.hook.pytest_configure.call_historic(kwargs=dict(config=self))
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 308, in call_historic
    INTERNALERROR>     res = self._hookexec(self, self.get_hookimpls(), kwargs)
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93, in _hookexec
    INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84, in <lambda>
    INTERNALERROR>     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 208, in _multicall
    INTERNALERROR>     return outcome.get_result()
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 80, in get_result
    INTERNALERROR>     raise ex[1].with_traceback(ex[2])
    INTERNALERROR>   File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187, in _multicall
    INTERNALERROR>     res = hook_impl.function(*args)
    INTERNALERROR>   File "/Users/prakhargurunani/Desktop/pytest-html/src/pytest_html/plugin.py", line 99, in pytest_configure
    INTERNALERROR>     raise OSError(f"No such file or directory: '{no_files_found}'")
    INTERNALERROR> OSError: No such file or directory: 'abc.css, xyz.css'

@nicoddemus Please see this.

[BeyondEvil]

Could you create a PR with the fix? @prakhargurunani 🙏

[FirePing32]

@BeyondEvil Sure ! Was just waiting for confirmation from dev team 🙂.

[FirePing32]

@BeyondEvil See #390