according to crash logs there are seem to be some instances that don't
always return the expected json, so lets be extra safe here
```
Exception java.lang.NullPointerException:
at com.keylesspalace.tusky.components.instanceinfo.InstanceInfoRepository$getInstanceInfo$2.invokeSuspend (InstanceInfoRepository.kt:67)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run (DispatchedTask.kt:108)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run (LimitedDispatcher.java:115)
at kotlinx.coroutines.scheduling.TaskImpl.run (Tasks.kt:103)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely (CoroutineScheduler.java:584)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask (CoroutineScheduler.kt:793)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker (CoroutineScheduler.kt:697)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run (CoroutineScheduler.kt:684)
```
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