JBIDE-13261 Conflicting handlers for org.jboss.tools.seam.ui.find.references

Conflicting handlers error messages are fixed.
Also, extra exception processing is fixed for Search Seam References is fixed. There was a big amount of
IndexOutOfBoundsException("index must be smaller than length") error messages logged at every Search operation
because of a buggy exception handling.

	modified:   seam/plugins/org.jboss.tools.seam.ui/plugin.xml
	modified:   seam/plugins/org.jboss.tools.seam.ui/src/org/jboss/tools/seam/ui/search/SeamSearchVisitor.java