Fixes several minor crashes

...a/de/kuschku/libquassel/quassel/syncables/BufferSyncer.kt

.../kuschku/libquassel/quassel/syncables/BufferViewConfig.kt

...chku/libquassel/quassel/syncables/HighlightRuleManager.kt

...kuschku/libquassel/quassel/syncables/IgnoreListManager.kt

...ava/de/kuschku/libquassel/quassel/syncables/IrcChannel.kt

.../de/kuschku/libquassel/quassel/syncables/IrcListHelper.kt

...n/java/de/kuschku/libquassel/quassel/syncables/IrcUser.kt

...n/java/de/kuschku/libquassel/quassel/syncables/Network.kt

...ava/de/kuschku/libquassel/quassel/syncables/RpcHandler.kt

.../libquassel/quassel/syncables/interfaces/IBufferSyncer.kt

...quassel/quassel/syncables/interfaces/IBufferViewConfig.kt

...sel/quassel/syncables/interfaces/IHighlightRuleManager.kt

...uassel/quassel/syncables/interfaces/IIgnoreListManager.kt

...ku/libquassel/quassel/syncables/interfaces/IIrcChannel.kt

...libquassel/quassel/syncables/interfaces/IIrcListHelper.kt

...schku/libquassel/quassel/syncables/interfaces/IIrcUser.kt

...schku/libquassel/quassel/syncables/interfaces/INetwork.kt

...ku/libquassel/quassel/syncables/interfaces/IRpcHandler.kt

...chku/libquassel/quassel/syncables/interfaces/ITransfer.kt