Corrupted PDF file can crash root opening

[kirillt]

ACRA caught a IOException for dev.arkbuilders.navigator
java.io.IOException: file not in PDF format or corrupted
        at android.graphics.pdf.PdfRenderer.nativeCreate(Native Method)
        at android.graphics.pdf.PdfRenderer.<init>(PdfRenderer.java:172)
        at space.taran.arklib.domain.meta.generator.DocumentMetadataGenerator.generate-gIAlu-s(DocumentMetadataGenerator.kt:51)
        at space.taran.arklib.domain.meta.MetadataGenerator$Companion.generate-gIAlu-s(MetadataGenerator.kt:40)
        at space.taran.arklib.domain.meta.RootMetadataProcessor$generate$4.invokeSuspend(RootMetadataProcessor.kt:100)
        at space.taran.arklib.domain.meta.RootMetadataProcessor$generate$4.invoke(Unknown Source:8)
        at space.taran.arklib.domain.meta.RootMetadataProcessor$generate$4.invoke(Unknown Source:4)
        at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89)
        at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:169)
        at kotlinx.coroutines.BuildersKt.withContext(Unknown Source:1)
        at space.taran.arklib.domain.meta.RootMetadataProcessor.generate(RootMetadataProcessor.kt:84)
        at space.taran.arklib.domain.meta.RootMetadataProcessor.access$generate(RootMetadataProcessor.kt:22)
        at space.taran.arklib.domain.meta.RootMetadataProcessor$generate$2$jobs$1$1.invokeSuspend(RootMetadataProcessor.kt:71)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
        Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@29f427d, Dispatchers.Main]