Revert "Hide kernel picker if nothing is returned (microsoft#182919)" (microsoft#183416)

This reverts commit 5015de8.

Author: DonJayamanne

src/vs/workbench/contrib/notebook/browser/viewParts/notebookKernelQuickPickStrategy.ts

@@ -568,7 +568,7 @@ export class KernelPickerMRUStrategy extends KernelPickerStrategyBase {
 						}
 						return true;
 					} else {
-						return false;
+						return this.displaySelectAnotherQuickPick(editor, false);
 					}
 				} catch (ex) {
 					return false;