Fixed shebang check. Previously it would hang on an unknown shebang

ethutil/script.go

@@ -10,16 +10,21 @@ import (
 
 // General compile function
 func Compile(script string) (ret []byte, err error) {
-	c := strings.Split(script, "\n")[0]
+	if len(script) > 2 {
+		line := strings.Split(script, "\n")[0]
 
-	if c == "#!serpent" {
+		if line[0:2] == "#!" {
+			switch line {
+			case "#!serpent":
 				byteCode, err := serpent.Compile(script)
 				if err != nil {
 					return nil, err
 				}
 
 				return byteCode, nil
+			}
 		} else {
+
 			compiler := mutan.NewCompiler(backend.NewEthereumBackend())
 			byteCode, errors := compiler.Compile(strings.NewReader(script))
 			if len(errors) > 0 {
@@ -34,4 +39,7 @@ func Compile(script string) (ret []byte, err error) {
 
 			return byteCode, nil
 		}
+	}
+
+	return nil, nil
 }