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The doc for Angular JS is downloaded from the web, when it's needed. The doc is cached in userdir and if the file exists for the documentation in the cache, then is not retrieved from internet anymore. The problem is that the file is created always, when the doc is downloaded. When the download is not success, then the cache file is created (empty) and never will be obtained the right documentation again.
Fixed in web-main.
Integrated into 'main-silver', will be available in build *201402130001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/e84c81e60898 User: Petr Pisl <ppisl@netbeans.org> Log: #241772 - The cache of documentation doesn't have to work correctly