converting HTML to PDF failed if no data type provided in img tag

[grigoriev]

Current Behavior

provided html contains the following tag

<img title="name.jpeg" src="data:null;base64, /9j/....

processing crashed:

2024-07-22 15:24:47 ::ffff:192.168.65.1 - - [2024-07-22 13:24:47] "POST /convert/html?presentational_hints=true&pdf_variant=pdf%2Fa-2b HTTP/1.1" 200 2977 0.021722
2024-07-22 15:28:16 ERROR:root:'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
2024-07-22 15:28:16 Traceback (most recent call last):
2024-07-22 15:28:16   File "/opt/weasyprint/app/WeasyprintController.py", line 35, in convert_html
2024-07-22 15:28:16     html = SvgUtils.process_svg(html)
2024-07-22 15:28:16            ^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-07-22 15:28:16   File "/opt/weasyprint/app/SvgUtils.py", line 15, in process_svg
2024-07-22 15:28:16     return re.sub(pattern, replace_img_base64, html)
2024-07-22 15:28:16            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-07-22 15:28:16   File "/usr/local/lib/python3.12/re/__init__.py", line 186, in sub
2024-07-22 15:28:16     return _compile(pattern, flags).sub(repl, string, count)
2024-07-22 15:28:16            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-07-22 15:28:16   File "/opt/weasyprint/app/SvgUtils.py", line 26, in replace_img_base64
2024-07-22 15:28:16     replaced_content_base64 = replace_svg_with_png(content_base64)
2024-07-22 15:28:16                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-07-22 15:28:16   File "/opt/weasyprint/app/SvgUtils.py", line 36, in replace_svg_with_png
2024-07-22 15:28:16     svg_content = base64.b64decode(possible_svg_base64_content).decode('utf-8')
2024-07-22 15:28:16                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2024-07-22 15:28:16 UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
2024-07-22 15:28:16 ::ffff:192.168.65.1 - - [2024-07-22 13:28:16] "POST /convert/html?presentational_hints=true&pdf_variant=pdf%2Fa-2b HTTP/1.1" 400 215 0.008822

Expected Behavior

image will not be replaced

Steps To Reproduce

see current behavior section

Anything else

No response