use unknown for interface we can't detect instead of ""

[msherif1234]

Description

need to be consistent when can't find interface name and always use unknown string

Dependencies

n/a

Checklist

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• Will this change affect NetObserv / Network Observability operator? If not, you can ignore the rest of this checklist.
• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
  • If so, make sure the JIRA epic is labelled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
  • If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • Standard QE validation, with pre-merge tests unless stated otherwise.
  • Regression tests only (e.g. refactoring with no user-facing change).
  • No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[codecov]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (6f1d70a) 33.86% compared to head (110b8ae) 34.06%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/exporter/proto.go	0.00%	16 Missing and 2 partials ⚠️
pkg/flow/deduper.go	85.00%	2 Missing and 1 partial ⚠️
pkg/utils/utils.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #250      +/-   ##
==========================================
+ Coverage   33.86%   34.06%   +0.20%     
==========================================
  Files          39       39              
  Lines        3479     3508      +29     
==========================================
+ Hits         1178     1195      +17     
- Misses       2233     2243      +10     
- Partials       68       70       +2     

Flag	Coverage Δ
unittests	34.06% <54.71%> (+0.20%)	⬆️

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[jotak]

/lgtm

[msherif1234]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msherif1234

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