Add dotcover warning message when there's no File elements

Signed-off-by: Luís Ferreira <[email protected]>

Author: ljmf00

src/Parsing/Processors/DotCoverProcessor.cs

@@ -26,6 +26,10 @@ public Report Parse(string file)
                                                 modules.Elements("File"))
             };
 
+            if (report.FilesList.Count == 0) {
+                Console.WriteLine ("Warning: Got a report without File elements. Consider report dotCover with --ReportType=DetailedXML");
+            }
+
             foreach (var module in namespaces)
             {
                 var classes = module.Elements("Type");