[FIX] Null channels cause dss.dss0 to crash

[paulroujansky]

Description

When the values of n_chans - 1 channels are set to zero, dss.dss0() returns a ValueError: expected square matrix message. This is because the passed input matrix c2 is one-dimensional (because it has 1 feature only, corresponding to the not-null channel).

Proposed fix is to leave it 2-dimensional by removing squeeze().

[codecov]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   67.30%   67.30%           
=======================================
  Files          14       14           
  Lines        1838     1838           
=======================================
  Hits         1237     1237           
  Misses        601      601           

Impacted Files	Coverage Δ
meegkit/dss.py	76.11% <100.00%> (ø)

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