fix tree merging for multiple params

[mathleur]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 77 lines in your changes are missing coverage. Please review.

Comparison is base (d21c190) 90.33% compared to head (2ae23da) 89.31%.
Report is 9 commits behind head on develop.

Files	Patch %	Lines
polytope/datacube/backends/fdb.py	0.00%	31 Missing ⚠️
tests/test_point_nearest.py	44.82%	16 Missing ⚠️
tests/test_multiple_param_fdb.py	47.36%	10 Missing ⚠️
polytope/utility/geometry.py	25.00%	9 Missing ⚠️
polytope/datacube/index_tree.py	62.50%	3 Missing ⚠️
setup.py	0.00%	2 Missing ⚠️
polytope/datacube/datacube_axis.py	87.50%	1 Missing ⚠️
polytope/engine/hullslicer.py	50.00%	1 Missing ⚠️
polytope/shapes.py	66.66%	1 Missing ⚠️
tests/test_ecmwf_oper_data_fdb.py	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #92      +/-   ##
===========================================
- Coverage    90.33%   89.31%   -1.02%     
===========================================
  Files           70       73       +3     
  Lines         6867     6984     +117     
===========================================
+ Hits          6203     6238      +35     
- Misses         664      746      +82     

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