taking care of removing extra ; if InnerException is not set.

StackExchange.Redis/StackExchange/Redis/ExceptionFactory.cs

@@ -106,8 +106,12 @@ internal static Exception NoConnectionAvailable(bool includeDetail, RedisCommand
 
             StringBuilder exceptionmessage = new StringBuilder("No connection is available to service this operation: ");
             exceptionmessage.Append(commandLabel);
+            string innermostExceptionstring = GetInnerMostExceptionMessage(innerException);
+            if (!string.IsNullOrEmpty(innermostExceptionstring))
+            {
                 exceptionmessage.Append("; ");
-            exceptionmessage.Append(GetInnerMostExceptionMessage(innerException));
+                exceptionmessage.Append(innermostExceptionstring);
+            }
 
             var ex = new RedisConnectionException(ConnectionFailureType.UnableToResolvePhysicalConnection, exceptionmessage.ToString(), innerException);