fix source setting KeyError: 'spec' in to_dict() method

[vsibirsk]

Short description:

Fix the issue in DataSource to_dict() method when setting source value in self.res if self.res doesn't have any spec

Which issue(s) this PR fixes:

Fixes issue introduced in #1601

[redhat-qe-bot]

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

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[vsibirsk]

/verified

[myakove]

can you please fill the missing parts in the first comment @vsibirsk ?

[myakove]

/lgtm

[vsibirsk]

/cherry-pick v4.15

[redhat-qe-bot1]

Cherry-picked PR fix source setting KeyError: 'spec' in to_dict() method into v4.15

[vsibirsk]

/cherry-pick v4.14

[redhat-qe-bot1]

Cherry-picked PR fix source setting KeyError: 'spec' in to_dict() method into v4.14