Filter out empty components when using reload methods on SpotsController

[zenangst]

This PR improves the usage of reloading SpotsController's with component models. Now components are deemed useless if they don't have any content, this results in the component model being filter out before reloading happens.

[codecov[bot]]

Codecov Report

Merging #806 into master will increase coverage by <.01%. The diff coverage is 86.2%.

@@            Coverage Diff             @@
##           master     #806      +/-   ##
==========================================
+ Coverage    84.3%   84.31%   +<.01%     
==========================================
  Files         152      152              
  Lines       10462    10486      +24     
==========================================
+ Hits         8820     8841      +21     
- Misses       1642     1645       +3

Flag	Coverage Δ
#ios	83.16% <86.2%> (-4.53%)	:arrow_down:
#osx	86.59% <92.59%> (+0.03%)	:arrow_up:
#tvos	82.31% <86.2%> (-4.48%)	:arrow_down:

Impacted Files	Coverage Δ
Sources/Shared/Structs/Parser.swift	83.78% <ø> (ø)	:arrow_up:
Sources/Shared/Structs/Configuration.swift	85.71% <ø> (ø)	:arrow_up:
Sources/iOS/Classes/SpotsController.swift	65.82% <ø> (ø)	:arrow_up:
...ces/iOS/Extensions/Delegate+iOS+UIScrollView.swift	48.32% <0%> (ø)	:arrow_up:
...potsTests/Shared/SpotsControllerManagerTests.swift	99.24% <100%> (+0.02%)	:arrow_up:
...ources/Shared/Classes/SpotsControllerManager.swift	75.87% <83.33%> (+0.29%)	:arrow_up:
Sources/iOS/Classes/DefaultItemView.swift	80.64% <0%> (-6.46%)	:arrow_down:

---

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 e1aea2e...aee0ca1. Read the comment docs.

[zenangst]

@onmyway133 @vadymmarkov mind taking a look now?