[MRG]Added test case for method bbox_no_intersection from utils to check no intersection logic

[rahul-bhave]

This PR contains the test case written to test the logic for method def bbox_intersection_area(ba, bb) from utils when no intersecting area is available.[line 403 and 404 from the utils.py]

Below is the test run output

$ python setup.py -v test
running pytest
running egg_info
writing camelot_py.egg-info\PKG-INFO
writing dependency_links to camelot_py.egg-info\dependency_links.txt
writing entry points to camelot_py.egg-info\entry_points.txt
writing requirements to camelot_py.egg-info\requires.txt
writing top-level names to camelot_py.egg-info\top_level.txt
'license_file' option was not specified
reading manifest file 'camelot_py.egg-info\SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'camelot_py.egg-info\SOURCES.txt'
running build_ext
============================= test session starts =============================
platform win32 -- Python 3.8.2, pytest-6.2.4, py-1.10.0, pluggy-0.13.1 -- C:\Users\XXXXX\XXXXX\XXXXX\camelot\venv3\Scripts\python.exe
cachedir: .pytest_cache
Matplotlib: 3.4.2
Freetype: 2.6.1
rootdir: C:\Users\XXXXX\XXXXX\XXXXX\camelot, configfile: setup.cfg
plugins: cov-2.12.1, mock-3.6.1, mpl-0.13
collecting ... collected 65 items

tests/test_utils.py::test_bbox_intersection_text PASSED                  [100%]

[rahul-bhave]

#https://github.com/camelot-dev/camelot/issues/76

[rahul-bhave]

##76

[MartinThoma]

Hey!

As camelot is dead, we try to build a maintained fork at pypdf_table_extraction.

Do you want to open the PR against that branch so that we can merge your improvement?