service/upower: do not crash when trying to set power profile w/o ppd

src/dbus/properties.hpp

@@ -235,6 +235,7 @@ public:
 	void updateAllDirect();
 	void updateAllViaGetAll();
 	[[nodiscard]] QString toString() const;
+	[[nodiscard]] bool isConnected() const { return this->interface; }
 
 	void pushPropertyUpdate(DBusPropertyCore* property);
 	void requestPropertyUpdate(DBusPropertyCore* property);

src/services/upower/powerprofiles.cpp

@@ -101,6 +101,12 @@ void PowerProfiles::init() {
 }
 
 void PowerProfiles::setProfile(PowerProfile::Enum profile) {
+	if (!this->properties.isConnected()) {
+		qCCritical(logPowerProfiles
+		) << "Cannot set power profile: power-profiles-daemon not accessible or not running";
+		return;
+	}
+
 	if (profile == PowerProfile::Performance && !this->bHasPerformanceProfile) {
 		qCCritical(logPowerProfiles
 		) << "Cannot request performance profile as it is not present for this device.";