Fixed test

Author: niemyjski

src/Exceptionless/Logging/InMemoryExceptionlessLog.cs

@@ -56,7 +56,7 @@ private void Write(LogEntry entry) {
             if (MaxEntriesToStore <= 0 || entry == null)
                 return;
 
-            if (entry.Level < MinimumLogLevel)
+            if (MinimumLogLevel != null && entry.Level < MinimumLogLevel)
                 return;
 
             entry.Date = DateTime.Now;