D16977: [weather] Fix broken observation display for temperature of 0 °

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added reviewers: Plasma, broulik.
Herald added a project: Plasma.
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REVISION SUMMARY
  For that also deduplicate any data extraction & conversion logic
  in helper methods for consistency

TEST PLAN
  Observation temperature of 0 ° no longer is shown as empty string,
  all other data is shown as before (tested by hardcoding 0 as temperature in
  the dataengine, to not have to wait for the next evening ;) ).

REPOSITORY
  R114 Plasma Addons

BRANCH
  fix0DegreeTemperature

REVISION DETAIL
  https://phabricator.kde.org/D16977

AFFECTED FILES
  applets/weather/package/contents/ui/main.qml

To: kossebau, #plasma, broulik
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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