Fix hamamatsu tiff reader if x axis not calibrated

[jlaehne]

Description of the change

Fixes reading error when Hamamatsu tiff file contains ScalingXScalingFile="Other" and not an address in the file (not calibrated axis).

Progress of the PR

• Change implemented (can be split into several points),
• [n/a] update docstring (if appropriate),
• [n/a] update user guide (if appropriate),
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:rosettasciio build of this PR (link in github checks)
• add tests,
• ready for review.

Minimal example of the bug fix or the new feature

from rsciio.tiff import file_reader
file_reader("hamamatsu.tiff")
# Your new feature...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.84%. Comparing base (4e67875) to head (a3d2f8b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #347   +/-   ##
=======================================
  Coverage   87.84%   87.84%           
=======================================
  Files          85       85           
  Lines       11242    11246    +4     
  Branches     2082     2084    +2     
=======================================
+ Hits         9875     9879    +4     
  Misses        868      868           
  Partials      499      499           

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[jlaehne]

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