Fix some crashes

(cherry picked from commit 5efb31bd71)

# Conflicts:
#	app/src/main/java/eu/kanade/presentation/browse/BrowseSourceScreen.kt
#	app/src/main/java/eu/kanade/presentation/browse/components/BrowseSourceToolbar.kt

app/src/main/java/eu/kanade/presentation/browse/BrowseSourceScreen.kt

@@ -94,7 +94,7 @@ fun BrowseSourceScreen(
             Column(modifier = Modifier.background(MaterialTheme.colorScheme.surface)) {
                 BrowseSourceToolbar(
                     state = presenter,
-                    source = presenter.source!!,
+                    source = presenter.source,
                     displayMode = presenter.displayMode.takeUnless { presenter.source!!.isEhBasedSource() && presenter.ehentaiBrowseDisplayMode },
                     onDisplayModeChange = { presenter.displayMode = it },
                     navigateUp = navigateUp,

app/src/main/java/eu/kanade/presentation/browse/components/BrowseSourceToolbar.kt

@@ -36,7 +36,7 @@ import exh.source.anyIs
 @Composable
 fun BrowseSourceToolbar(
     state: BrowseSourceState,
-    source: CatalogueSource,
+    source: CatalogueSource?,
     displayMode: LibraryDisplayMode?,
     onDisplayModeChange: (LibraryDisplayMode) -> Unit,
     navigateUp: () -> Unit,
@@ -50,7 +50,7 @@ fun BrowseSourceToolbar(
 ) {
     if (state.searchQuery == null) {
         BrowseSourceRegularToolbar(
-            title = if (state.isUserQuery) state.currentFilter.query else source.name,
+            title = if (state.isUserQuery) state.currentFilter.query else source?.name.orEmpty(),
             isLocalSource = source is LocalSource,
             // SY -->
             isConfigurableSource = source.anyIs<ConfigurableSource>(),