build number:2.6.0.v20100330-0630

steps to reproduce:
1. new a library with name " .rptlirary".
2. new a report.
3. in resource explore, use the library
4. in outline, refresh library

expected result:
if not support such name ,report error and don't use it.
if support, there should be no error.

actual result:
after use library, pop up error dialog "the value of the property "namespace" is required."
refresh library will show used library node but in xml source there are no library related xml source.
close and reopen the report, the library node will disappear.
now the operation is not allowed if the target library namespace is not valid.
2.6.0.v20100505-0630