Improves error handling on script gaiahub.sh

[criadoperez]

Goal of PR

• Fixes issue gaiahub.sh returns error when no parameter is entered #400
• Better error handling on gaiahub.sh

[codecov]

Codecov Report

Merging #401 (3a0f2a4) into master (99cbc62) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #401   +/-   ##
=======================================
  Coverage   75.78%   75.78%           
=======================================
  Files          14       14           
  Lines        1474     1474           
  Branches      280      280           
=======================================
  Hits         1117     1117           
  Misses        282      282           
  Partials       75       75           

---

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 99cbc62...3a0f2a4. Read the comment docs.