itest: mine empty blocks in route blinding test

[carlaKC]

skippin the itest queue

[github-actions]

Pull reviewers stats

Stats of the last 30 days for lnd:

	User	Total reviews	Time to review	Total comments

[coveralls]

Pull Request Test Coverage Report for Build 10834665025

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 81 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.02%) to 58.564%

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Files with Coverage Reduction	New Missed Lines	%
server.go	2	63.7%
fn/list.go	2	98.67%
config.go	3	55.65%
watchtower/wtdb/range_index.go	3	96.12%
chainntnfs/interface.go	4	69.54%
peer/brontide.go	5	78.28%
chainreg/chainregistry.go	5	52.89%
chainntnfs/bitcoindnotify/bitcoind.go	5	80.91%
chainntnfs/btcdnotify/btcd.go	5	82.35%
funding/manager.go	6	75.13%

Totals
Change from base Build 10834663853:	0.02%
Covered Lines:	127825
Relevant Lines:	218265

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💛 - Coveralls