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Guard against null objects

Alexey Min requested to merge alexeymin/discover:work/fix-qml-warnings into master

Sometimes "application" can be null. Add more checks for that.

examples of errors are:

qrc:/qml/InstallApplicationButton.qml:18: TypeError: Cannot read property 'state' of null
qrc:/qml/InstallApplicationButton.qml:24: TypeError: Cannot read property 'isInstalled' of null
qrc:/qml/InstallApplicationButton.qml:41: TypeError: Cannot read property 'isInstalled' of null
qrc:/qml/InstallApplicationButton.qml:42: TypeError: Cannot read property 'isInstalled' of null
qrc:/qml/InstallApplicationButton.qml:44: TypeError: Cannot read property 'isInstalled' of null
qrc:/qml/InstallApplicationButton.qml:85: TypeError: Cannot read property 'state' of null

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