ValueError when using debug_tablefinder

[rneumann7]

Describe the bug

Tried the extract-table-ca-warn-report.pynb example and got an ValueError when trying to call debug_tablefinder on PageImage.

Code to reproduce the problem

See extract-table-ca-warn-report.ipynb from examples/notebooks/extract-table-ca-warn-report.ipynb, last section (12)

Screenshots

Environment

• pdfplumber version: [0.6.2]

[jsvine]

Thank you for flagging this @rneumann7! Have now squashed that bug and pushed the fix to this repository and a new version, v0.7.1.