ENH: change warning messages to error messages if band range synthax is invalid

Modules/IO/ExtendedFilename/src/otbExtendedFilenameHelper.cxx

@@ -244,6 +244,7 @@ ExtendedFilenameHelper
     else
       {
       // Invalid range wrt. the given number of bands
+      itkExceptionMacro("Invalid band number.");
       return false;
       }
     }

Modules/IO/ExtendedFilename/src/otbExtendedFilenameToReaderOptions.cxx

@@ -138,7 +138,7 @@ ExtendedFilenameToReaderOptions
       }
     else
       {
-      itkWarningMacro("Unkwown value "<<map["bands"]<<" for band range. Expect a list of tokens separated with comma (each token being a single band index or a range in the form x:y)");
+      itkExceptionMacro("Unkwown value "<<map["bands"]<<" for band range. Expect a list of tokens separated with comma (each token being a single band index or a range in the form x:y)");
       }
     }