Add GoStdlib mnemonic for special handling of ''

This mnemonic has '' args, which would become literal empty when
combined by strings.Join. To prevent this, add it to the
special-handling function.

Bug: 284483729
Test: N/A
Change-Id: Ibd3c3ebc55284882e7336487319070b9710076d3
diff --git a/bazel/aquery.go b/bazel/aquery.go
index 3428328..2c080a1 100644
--- a/bazel/aquery.go
+++ b/bazel/aquery.go
@@ -459,7 +459,7 @@
 // escapes the args received from aquery and creates a command string
 func commandString(actionEntry *analysis_v2_proto.Action) string {
 	switch actionEntry.Mnemonic {
-	case "GoCompilePkg":
+	case "GoCompilePkg", "GoStdlib":
 		argsEscaped := []string{}
 		for _, arg := range actionEntry.Arguments {
 			if arg == "" {