Expect ApplicationInfo#splitSourceDirs to be null

Also handle errors like these a bit better

app/src/main/java/com/stevesoltys/seedvault/transport/backup/ApkBackup.kt

@@ -154,7 +154,8 @@ internal class ApkBackup(
         streamGetter: suspend (name: String) -> OutputStream,
     ): List<ApkSplit> {
         check(packageInfo.splitNames != null)
-        val splitSourceDirs = packageInfo.applicationInfo.splitSourceDirs
+        // attention: though not documented, splitSourceDirs can be null
+        val splitSourceDirs = packageInfo.applicationInfo.splitSourceDirs ?: emptyArray()
         check(packageInfo.splitNames.size == splitSourceDirs.size) {
             "Size Mismatch! ${packageInfo.splitNames.size} != ${splitSourceDirs.size} " +
                 "splitNames is ${packageInfo.splitNames.toList()}, " +

app/src/main/java/com/stevesoltys/seedvault/transport/backup/BackupCoordinator.kt

@@ -381,7 +381,13 @@ internal class BackupCoordinator(
                 }
                 // hook in here to back up APKs of apps that are otherwise not allowed for backup
                 if (isPmBackup && settingsManager.canDoBackupNow()) {
+                    try {
                         backUpApksOfNotBackedUpPackages()
+                    } catch (e: Exception) {
+                        Log.e(TAG, "Error backing up APKs of opt-out apps: ", e)
+                        // We are re-throwing this, because we want to know about problems here
+                        throw e
+                    }
                 }
             }
             result

app/src/main/java/com/stevesoltys/seedvault/transport/backup/KVBackup.kt

@@ -209,6 +209,7 @@ internal class KVBackup(
             else state.db.close()
             TRANSPORT_OK
         } catch (e: IOException) {
+            Log.e(TAG, "Error uploading DB", e)
             TRANSPORT_ERROR
         } finally {
             this.state = null