fix(types,client,server): improve type safety and harden client/server message handling

ts/smartuniverse.classes.universeconnection.ts

@@ -36,7 +36,7 @@ export class UniverseConnection {
     universeCache: UniverseCache,
     universeConnectionArg: UniverseConnection
   ): Promise<UniverseConnection> {
-    let connectionToReturn: UniverseConnection;
+    let connectionToReturn: UniverseConnection | undefined;
     universeCache.connectionMap.forEach(async (existingConnection) => {
       if (existingConnection.socketConnection === universeConnectionArg.socketConnection) {
         connectionToReturn = await this.mergeUniverseConnections(
@@ -63,7 +63,7 @@ export class UniverseConnection {
         universeRef,
         authenticationRequest.name
       );
-      if (universeChannelToAuthenticateAgainst.passphrase === authenticationRequest.passphrase) {
+      if (universeChannelToAuthenticateAgainst?.passphrase === authenticationRequest.passphrase) {
         universeConnectionArg.authenticatedChannels.push(universeChannelToAuthenticateAgainst);
       }
     }
@@ -86,7 +86,7 @@ export class UniverseConnection {
   public static findUniverseConnectionBySocketConnection(
     universeCache: UniverseCache,
     socketConnectionArg: plugins.smartsocket.SocketConnection
-  ): UniverseConnection {
+  ): UniverseConnection | undefined {
     const universeConnection = universeCache.connectionMap.findSync((universeConnectionArg) => {
       return universeConnectionArg.socketConnection === socketConnectionArg;
     });