Don't panic for nil pod watch object

[tbarrella]

to fix #2103

[codecov-io]

Codecov Report

Merging #2112 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2112      +/-   ##
==========================================
- Coverage   56.29%   56.28%   -0.02%     
==========================================
  Files         180      180              
  Lines        7794     7796       +2     
==========================================
  Hits         4388     4388              
- Misses       2989     2991       +2     
  Partials      417      417

Impacted Files	Coverage Δ
pkg/skaffold/kubernetes/wait.go	0% <0%> (ø)	⬆️

---

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 06d01b1...ca057fe. Read the comment docs.

[balopat]

Thank you for your contribution!

[tbarrella]

(Thank you! I'm a big fan of Skaffold and everyone's work on it; wish I could contribute more)

[priyawadhwa]

@tbarrella if you're interested in contributing more, here's a list of good first issues, and possibly more complicated issues we'd love some help with here!

[tbarrella]

Cool, thank you!