Fix repeated resolving of sender in configuration

[pavolloffay]

Signed-off-by: Pavol Loffay [email protected]

[yurishkuro]

nit:

if sender == null {
    sender = resolve()
}
return sender

[codecov]

Codecov Report

Merging #555 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #555      +/-   ##
============================================
+ Coverage     88.76%   88.81%   +0.04%     
  Complexity      519      519              
============================================
  Files            67       67              
  Lines          1896     1895       -1     
  Branches        243      243              
============================================
  Hits           1683     1683              
- Misses          138      139       +1     
+ Partials         75       73       -2

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/java/io/jaegertracing/Configuration.java	95.41% <ø> (+0.81%)	42 <0> (ø)	⬇️
...java/io/jaegertracing/zipkin/ZipkinV2Reporter.java	71.42% <0%> (-28.58%)	2% <0%> (-1%)
...ing/internal/samplers/RemoteControlledSampler.java	90.69% <0%> (+1.16%)	18% <0%> (+1%)	⬆️

---

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 41a9d10...61f27f7. Read the comment docs.