D6608: [PlasmaComponents Menu] Don't crash on null action

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  You can assign a `QAction` as "action", this way you can just pass it e.g. `plasmoid.action("configure")`.
  However, when assigning a `null` action as can happen with kiosk restrictions, it would crash as it assigns `m_action` the `nullptr` but never checks for that.
  This patch ensures we always have a `QAction`, keeping the one we created ourselves, if neccessary.
  Also deletes our own action if an external one is assigned

TEST PLAN
  Created a menu and applied `plasma/plasmashell/unlockedDesktop=false` and opened it, no longer crashes:
  
    PlasmaComponents.ContextMenu {
        id: contextMenu
    
        PlasmaComponents.MenuItem {
            action: plasmoid.action("configure")
        }
    }
  
  Manual test has a new button to test this.
  F3808090: Screenshot_20170710_151842.png <https://phabricator.kde.org/F3808090>

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D6608

AFFECTED FILES
  src/declarativeimports/plasmacomponents/qmenuitem.cpp
  src/declarativeimports/plasmacomponents/qmenuitem.h
  tests/components/menu.qml

To: broulik, #plasma
Cc: plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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