It could be that the geometry content of your DAE file is a type that the Blender importer does not understand. I was trying to read in Collada files that were made from triangle strips and I got the same result. No error message, no visible geometry, no objects in the scene tree. The files passed the consistency checker with no errors. These were files I was generating myself, so I was able to change the geometry from triangle strips to triangles and it worked fine. I am using an older version of Blender, 2.69.
When I searched for information on Blender importing Collada triangle strips I found old reports of the importer not working, but no recent reports on working/not working.