Merge pull request #842 from Styxxy/bugfixes/834-report-justfilename

Fixes #834 : error reportfile without directory specified

src/ReportWriter.cs

@@ -15,7 +15,7 @@ public static void Write(string reportPath, IEnumerable<FormattedFile> formatted
             var reportFilePath = GetReportFilePath(reportPath);
             var reportFolderPath = Path.GetDirectoryName(reportFilePath);
 
-            if (reportFolderPath != null && !Directory.Exists(reportFolderPath))
+            if (!string.IsNullOrEmpty(reportFolderPath) && !Directory.Exists(reportFolderPath))
             {
                 Directory.CreateDirectory(reportFolderPath);
             }