fix(open): fail fast on 'open vscode' and 'open ssms' with no current context

Without a current context, both commands would call config.CurrentContext() (returning zero-value endpoint/user) and proceed to write an empty profile or launch with an empty host. Match start/stop/uninstall by exiting with 'No current context' and a hint to 'sqlcmd config get-contexts'.

Author: dlevy-msft-sql

cmd/modern/root/open/ssms_run_windows.go

@@ -25,6 +25,12 @@ const minSsmsVersion = 21
 func (c *SSMS) run() {
 	c.validateVersion()
 
+	if config.CurrentContextName() == "" {
+		c.Output().FatalWithHintExamples([][]string{
+			{localizer.Sprintf("To view available contexts"), "sqlcmd config get-contexts"},
+		}, localizer.Sprintf("No current context"))
+	}
+
 	endpoint, user := config.CurrentContext()
 	isLocalConnection := isLocalEndpoint(endpoint)
 

cmd/modern/root/open/vscode.go

@@ -59,6 +59,12 @@ func (c *VSCode) DefineCommand(...cmdparser.CommandOptions) {
 // The connection profile will be added to VS Code's user settings to work
 // with the MSSQL extension.
 func (c *VSCode) run() {
+	if config.CurrentContextName() == "" {
+		c.Output().FatalWithHintExamples([][]string{
+			{localizer.Sprintf("To view available contexts"), "sqlcmd config get-contexts"},
+		}, localizer.Sprintf("No current context"))
+	}
+
 	endpoint, user := config.CurrentContext()
 
 	build := c.resolveBuild()