Fix/2830 - Dynamic Deck Dynamo rendering fix

[davidjgonzalez]

Allows a generic list to have no jcr:content/list without throwing NPE's as this is the initial state. A GL with no jcr:content/list is considered empty.

[codecov]

Codecov Report

Merging #2835 (62cf00e) into master (02a084a) will increase coverage by 0.00%.
The diff coverage is 94.44%.

@@            Coverage Diff            @@
##             master    #2835   +/-   ##
=========================================
  Coverage     53.89%   53.90%           
- Complexity     5574     5575    +1     
=========================================
  Files           753      753           
  Lines         30607    30609    +2     
  Branches       3964     3964           
=========================================
+ Hits          16497    16500    +3     
  Misses        12565    12565           
+ Partials       1545     1544    -1     

Impacted Files	Coverage Δ
...acs/commons/genericlists/impl/GenericListImpl.java	74.50% <94.11%> (+1.59%)	⬆️
...s/genericlists/impl/GenericListAdapterFactory.java	63.63% <100.00%> (+5.30%)	⬆️

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[kwin]

LGTM