No longer requesting exceptions as images by default. This makes it less likely to litter a cache with in-image exception reports. r=ahocevar,erilem,bartvde (closes #3261)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11894 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Tile/Image/IFrame.html

@@ -140,7 +140,7 @@
         var tParams = {
             SERVICE: "WMS", VERSION: "1.1.1",
             REQUEST: "GetMap", STYLES: "",
-            EXCEPTIONS: "application/vnd.ogc.se_inimage", FORMAT: "image/jpeg",
+            FORMAT: "image/jpeg",
             SRS: "EPSG:4326", BBOX: [1,2,3,4],
             WIDTH: String(size.w), HEIGHT: String(size.h)
         };