STS-2696: Unable to create editor ID
com.springsource.sts.config.ui.editors.SpringConfigEditor: Invalid
Input: Must be IFileEditorInput
Fix NPE when form pages for namespaces haven't been loaded
STS-2696: fix a number of text hover NPEs
STS-2696: fix potential NPEs in IHyperlinkCalculators
STS-2696: fix potential NPEs in IContentAssistCalculators