fix: nested non commands trigger stack overflow

Signed-off-by: Chapman Pendery <cpendery@vt.edu>

autocomplete/.snapshots/autocomplete-TestLoadSuggestions-func1-nestedNonCommands-suggestions

@@ -0,0 +1,2 @@
+([]string) {
+}

autocomplete/completion.go

@@ -189,6 +189,10 @@ func handleSubcommand(tokens []commandToken, spec model.Subcommand, persistentOp
 		return handleSubcommand(tokens[1:], *subcommand, persistentOptions, false, false, getPersistentTokens(acceptedTokens))
 	}
 
+	if len(spec.Args) == 0 { // not subcommand or option & no args exist
+		return
+	}
+
 	return handleArg(tokens, spec.Args, spec, persistentOptions, acceptedTokens, false, false)
 }
 

autocomplete/completion_test.go

@@ -28,7 +28,7 @@ func TestLoadSuggestions(t *testing.T) {
 		{Name: "providedArgDescription", Cmd: "act completion bash -a "},
 		{Name: "completedOptionWithArg", Cmd: "act completion bash -a 'actor' "},
 		{Name: "command", Cmd: "sudo git sta", Skip: true}, // TODO: fix skipped test
-		{Name: "nestedNonCommands", Cmd: "az az ", Skip: true}, // TODO: fix skipped test
+		{Name: "nestedNonCommands", Cmd: "az az "},
 	}
 	for _, test := range tests {
 		test := test