svn: Refactored RepositoryTreeNode - made myChildren @NotNull and final
svn: Refactored RepositoryTreeNode - removed unused methods/parameters, code simplified, @NotNull
svn: Refactored Loader, CacheLoader, RepositoryLoader - @NotNull, removed unused code, code simplified
IDEA-128840 Fixed rendering of "Loading..." node and error nodes in repository browser
RUBY-15651: if the document is empty then we have nothing to scroll
testing ChameleonAction
Merge branch 'svn_18_3'