refactor: Remove unused EmptyPagingSource class #3156

Job	Run time
Custom lint	39s
ktlintCheck	1m 6s
Android Assemble (orange, Fdroid, Debug)	2m 31s
Android Assemble (orange, Fdroid, Release)	4m 38s
Android Lint (orange, Fdroid, Debug)	4m 41s
Android Assemble (orange, Github, Debug)	2m 46s
Android Test (orange, Fdroid, Debug)	3m 0s
Android Lint (orange, Fdroid, Release)	4m 16s
Android Assemble (orange, Github, Release)	4m 59s
Android Test (orange, Fdroid, Release)	3m 5s
Test tools	47s
Android Test (orange, Github, Debug)	2m 59s
Android Lint (orange, Github, Debug)	4m 15s
Android Assemble (orange, Google, Debug)	2m 41s
Android Test (orange, Github, Release)	2m 54s
Android Assemble (orange, Google, Release)	5m 21s
Android Test (orange, Google, Debug)	3m 14s
Android Lint (orange, Github, Release)	4m 8s
Android Lint (orange, Google, Debug)	4m 23s
Android Test (orange, Google, Release)	3m 9s
Android Lint (orange, Google, Release)	4m 32s
	1h 10m 4s

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