tethysplatform / tethys / 12614893093

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Avoid "File name too long" error (#1128)

* Avoid "File name too long" error

Any file error will be ignored and jump straight to treating var as CSS text.
fixes tethysplatform/tethys#1127

* Add docstring and update import order

* Add unit test

* Remove trailing whitespace

* Log a warning if var looks like a filename but can't load

The login page calls load_custom_css() twice with an empty var, so this now returns early for that.

* Update code style test

load_custom_css() now returns an empty string for a file that does not exist, so test_get_css_is_code() has been updated to test CSS code.

* Apply black formatting

* Remove unnecessary pass statement

Co-authored-by: Nathan Swain <swainn@users.noreply.github.com>

* Add comment for is_file

Co-authored-by: Nathan Swain <swainn@users.noreply.github.com>

* Add comment about long CSS string causing OSError

Co-authored-by: Nathan Swain <swainn@users.noreply.github.com>

* Add comment about determining if it is a CSS string

Co-authored-by: Nathan Swain <swainn@users.noreply.github.com>

* Apply black/flake8 formatting

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Co-authored-by: Nathan Swain <swainn@users.noreply.github.com>

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