D29799: [kcms/notifications] Port "no search result" message to PlaceholderMessage

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Plasma, broulik.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Now the appearance is consistent with other similar messages, as well as the
  one to the right of it.

TEST PLAN
  F8326167: Screenshot_20200516_085803.png <https://phabricator.kde.org/F8326167>

REPOSITORY
  R119 Plasma Desktop

BRANCH
  port-notifications-kcm-to-placeholdermessage (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29799

AFFECTED FILES
  kcms/notifications/package/contents/ui/SourcesPage.qml

To: ngraham, #vdg, #plasma, broulik
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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