fix: Do not crash when adding a watchtower alert for a missing cipher item

common/src/commonMain/kotlin/com/artemchep/keyguard/common/usecase/impl/WatchtowerSyncerImpl.kt

@@ -145,6 +145,9 @@ private class WatchtowerClient(
                     val results = processor.process(ciphers)
                     db.transaction {
                         results.forEach { r ->
+                            // We might be inserting a threat report on a cipher that
+                            // does not exist anymore. This is fine, just ignore it.
+                            runCatching {
                                 db.watchtowerThreatQueries.upsert(
                                     value = r.value,
                                     threat = r.threat && !r.cipher.deleted,
@@ -156,6 +159,7 @@ private class WatchtowerClient(
                             }
                         }
                     }
+                }
                 .flowOn(Dispatchers.Default)
                 .launchIn(this)
         }