[release-1.15] make array when filters is nil

[knative-prow-robot]

This is an automated cherry-pick of #2569

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 65.52%. Comparing base (858a0e8) to head (b9e413d).
Report is 1 commits behind head on release-1.15.

Files with missing lines	Patch %	Lines
cmd/subscribe.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.15    #2570       +/-   ##
=================================================
+ Coverage         50.98%   65.52%   +14.54%     
=================================================
  Files               127      129        +2     
  Lines             11920    15351     +3431     
=================================================
+ Hits               6077    10059     +3982     
+ Misses             5136     4328      -808     
- Partials            707      964      +257     

Flag	Coverage Δ
e2e-test	35.91% <0.00%> (?)
e2e-test-oncluster	32.46% <0.00%> (?)
e2e-test-oncluster-runtime	28.42% <0.00%> (?)
e2e-test-runtime-go	26.46% <0.00%> (?)
e2e-test-runtime-node	25.86% <0.00%> (?)
e2e-test-runtime-python	25.86% <0.00%> (?)
e2e-test-runtime-quarkus	26.01% <0.00%> (?)
e2e-test-runtime-rust	25.02% <0.00%> (?)
e2e-test-runtime-springboot	25.06% <0.00%> (?)
e2e-test-runtime-typescript	25.97% <0.00%> (?)
integration-tests	51.94% <25.00%> (?)
unit-tests	50.57% <25.00%> (?)

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[matejvasek]

/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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