IndexError: list index out of range in export_image function when accessing filters[-1][0] due to an empty or improperly structured filters list.

[vanshika-panwar]

Bug report

• encountered an IndexError in the export_image function of pdfminer, specifically in this line:
  if filters[-1][0] in LITERALS_DCT_DECODE:
• The error occurs when attempting to access filters[-1][0], which fails when filters is either empty or not structured as expected. Please investigate if there should be additional checks to handle these cases gracefully.

Traceback

Traceback (most recent call last):\n File "/usr/src/python-app/processor/pdf_processor.py", line 114, in __get_image_raw_data\n file_name = image_writer.export_image(image=image)\n File "/opt/conda/envs/env/lib/python3.9/site-packages/pdfminer/image.py", line 108, in export_image\n if filters[-1][0] in LITERALS_DCT_DECODE:\nIndexError: list index out of range

attaching the pdf used
vietnam.pdf

@pietermarsman please review