Raise error when from_deepmd_npy_mixed with not-a-directory para.

[iProzd]

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 :tada:

Comparison is base (f8c5d4a) 82.51% compared to head (91deabf) 82.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #432      +/-   ##
==========================================
+ Coverage   82.51%   82.53%   +0.02%     
==========================================
  Files          68       68              
  Lines        6198     6206       +8     
==========================================
+ Hits         5114     5122       +8     
  Misses       1084     1084              

Impacted Files	Coverage Δ
dpdata/bond_order_system.py	68.11% <ø> (ø)
dpdata/cli.py	0.00% <ø> (ø)
dpdata/cp2k/cell.py	82.14% <ø> (ø)
dpdata/cp2k/output.py	97.84% <ø> (ø)
dpdata/fhi_aims/output.py	90.37% <ø> (ø)
dpdata/plugins/3dmol.py	46.66% <ø> (ø)
dpdata/plugins/ase.py	78.78% <ø> (ø)
dpdata/siesta/aiMD_output.py	97.47% <ø> (ø)
dpdata/xyz/quip_gap_xyz.py	93.16% <ø> (ø)
dpdata/plugins/deepmd.py	67.74% <100.00%> (+0.26%)	:arrow_up:
... and 1 more

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