retrieval: skip payment channel creation if total price is zero

[dirkmc]

No description provided.

[codecov-io]

Codecov Report

Merging #480 (cec49f5) into master (5af7592) will decrease coverage by 1.07%.
The diff coverage is 81.82%.

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
- Coverage   66.12%   65.05%   -1.06%     
==========================================
  Files          50       50              
  Lines        3196     3256      +60     
==========================================
+ Hits         2113     2118       +5     
- Misses        856      911      +55     
  Partials      227      227              

Impacted Files	Coverage Δ
retrievalmarket/impl/clientstates/client_fsm.go	74.34% <ø> (ø)
retrievalmarket/impl/dtutils/dtutils.go	79.44% <0.00%> (-0.74%)	⬇️
...rievalmarket/impl/requestvalidation/revalidator.go	79.57% <84.62%> (+0.16%)	⬆️
retrievalmarket/impl/clientstates/client_states.go	92.31% <100.00%> (+0.42%)	⬆️
storagemarket/impl/provider_environments.go	0.00% <0.00%> (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 bd2b4d4...cec49f5. Read the comment docs.