remove unused else from the Observable

[VovaStelmashchuk]

Remove unused else from the Observable class.

[akarnokd]

Please do not unroll star imports.

[VovaStelmashchuk]

Fixed.

[VovaStelmashchuk]

@akarnokd Maybe you can include some rule for the import bloc to CONTRIBUTING.md ?

[akarnokd]

@jordan1997

When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible.

But don't worry, we will warn you if there is a stylistic problem.

[codecov]

Codecov Report

Merging #6485 into 2.x will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #6485      +/-   ##
============================================
- Coverage     98.28%   98.24%   -0.05%     
+ Complexity     6297     6294       -3     
============================================
  Files           675      675              
  Lines         45159    45159              
  Branches       6244     6244              
============================================
- Hits          44384    44365      -19     
- Misses          243      248       +5     
- Partials        532      546      +14

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Observable.java	100% <100%> (ø)	542 <0> (ø)	⬇️
...l/operators/observable/ObservableFlatMapMaybe.java	85.62% <0%> (-6.54%)	2% <0%> (ø)
.../operators/flowable/FlowableBlockingSubscribe.java	93.02% <0%> (-4.66%)	10% <0%> (-1%)
...ava/io/reactivex/processors/BehaviorProcessor.java	96.86% <0%> (-2.25%)	60% <0%> (ø)
...activex/internal/schedulers/ExecutorScheduler.java	95.97% <0%> (-2.02%)	10% <0%> (ø)
...activex/internal/schedulers/ScheduledRunnable.java	98.07% <0%> (-1.93%)	29% <0%> (-1%)
...nternal/operators/observable/ObservableCreate.java	97.43% <0%> (-1.71%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.93% <0%> (-1.64%)	2% <0%> (ø)
...a/io/reactivex/internal/util/QueueDrainHelper.java	98.61% <0%> (-1.39%)	57% <0%> (-1%)
...ernal/operators/flowable/FlowableFromIterable.java	95.18% <0%> (-1.07%)	5% <0%> (ø)
... and 18 more

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