fixed PY-14816 IPython Notebook: Pycharm is unresponsive when trying to start notebook server

(cherry picked from commit d1484c93a192f3718f66e86e6f3216e748b62636)
fixed PY-14816 IPython Notebook: Pycharm is unresponsive when trying to start notebook server

(cherry picked from commit cece57377b9293c77161cdc8db74257ec31d4d74)
fixed PY-14819 IPython Notebook: invalid link to settings in popup for missing configuration

(cherry picked from commit 4b3922203baa19edd7ae20f96c907e40c0dc7720)
fixed PY-14814 IPython Notebook: commitDocument left PSI inconsistent: Throwable at com.intellij.psi.impl.DebugUtil.currentStackTrace

(cherry picked from commit 8489db4d9faf7ad345671b2ff33ca82359bddd38)