Don't create an Enum type for views sort it it is empty.

[mkhamash]

Stopping ViewSortByDeriver from creating an empty ENUM type, since this would cause an error in GraphQL explore.

Uncaught Error: .......ViewSortBy values must be an object with value names as keys.

"kind":"ENUM",
"name":"....ViewSortBy",
"description":"",
"fields":null,
"inputFields":null,
"interfaces":null,
"enumValues":[
],
"possibleTypes":null

[codecov[bot]]

Codecov Report

Merging #9 into 8.x-1.x will increase coverage by 0.03%. The diff coverage is 100%.

@@           Coverage Diff            @@
##           8.x-1.x    #9      +/-   ##
========================================
+ Coverage    76.96%   77%   +0.03%     
========================================
  Files           23    23              
  Lines          699   700       +1     
========================================
+ Hits           538   539       +1     
  Misses         161   161

Impacted Files	Coverage Δ
src/Plugin/Deriver/Enums/ViewSortByDeriver.php	95.23% <100%> (+0.23%)	:arrow_up:

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[fubhy]

Thanks!