handled error case if no devfile registry available#2706

dgolovin merged 2 commits intoredhat-developer:mainredhat-developer/vscode-openshift-tools:mainfrom

msivasubramaniaan:2705-devfile-registry-view-does-not-show-errors-for-connectivity-related-issues-and-stays-in-loading-registry-view-mode-forevermsivasubramaniaan/vscode-openshift-tools:2705-devfile-registry-view-does-not-show-errors-for-connectivity-related-issues-and-stays-in-loading-registry-view-mode-foreverCopy head branch name to clipboard