Scatterplot: Fix crash for a single time tick

[janezd]

Issue

Fixes #6086.

If there is only a single tick or no ticks, min that computed the min difference crashed.

Description of changes

Provide default argument. It equals the difference between the min and the max value, so tickStrings knows how to formulate the label.

Includes

• [X] Code changes
• [X] Tests

[janezd]

test_pandas fails. Not my fault, or is it?

[PrimozGodec]

test_pandas fails. Not my fault, or is it?

It isn't your fault. It may be due to the latest pandas release.

[PrimozGodec]

Here is the PR that solves the issue https://github.com/biolab/orange3/pull/6145

[codecov[bot]]

Codecov Report

Merging #6144 (e0ce236) into master (1d10fb4) will increase coverage by 0.00%. The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6144   +/-   ##
=======================================
  Coverage   86.45%   86.46%           
=======================================
  Files         315      315           
  Lines       67645    67645           
=======================================
+ Hits        58485    58488    +3     
+ Misses       9160     9157    -3