[FIX] Add early escape from TEDICA decision tree

[tsalo]

Closes #297.

Changes proposed in this pull request:

• Add early stopping procedure to TEDICA decision for when no potential BOLD components are identified in Step 1.

[codecov]

Codecov Report

Merging #298 into master will decrease coverage by 0.16%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #298      +/-   ##
=========================================
- Coverage   49.36%   49.2%   -0.17%     
=========================================
  Files          39      39              
  Lines        2133    2140       +7     
=========================================
  Hits         1053    1053              
- Misses       1080    1087       +7

Impacted Files	Coverage Δ
tedana/selection/tedica.py	23.52% <0%> (-1.28%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0c0d704...5fce033. Read the comment docs.

[jbteves]

LGTM. It's the same escape as used later for a similar problem, so this is probably the most consistent way to handle it.

[emdupre]

👍 Looks great to me, too ! I think it will at least make it clear to folks what's happened in their dataset.