generate_page_range: warn, not raise, if start==end, fix #1106

[kba]

No description provided.

[MehmedGIT]

Seems to fix the issue on my side. I am just not sure whether having a warning for each processing request with a single page will not be too much but that is a small detail. So good to be merged!

[kba]

I am just not sure whether having a warning for each processing request with a single page will not be too much but that is a small detail.

We can either redirect warnings to logging https://docs.python.org/3/library/logging.html#logging.captureWarnings and handle/hide them that way.

There's also methods to filter warnings directly, e.g. https://docs.python.org/3/library/warnings.html#the-warnings-filter