Minor fixed and additions for block proc

* Path check length
* Genesis include TD
* Output TD on last block

ethutil/path.go

@@ -12,7 +12,7 @@ func ExpandHomePath(p string) (path string) {
 	path = p
 
 	// Check in case of paths like "/something/~/something/"
-	if path[:2] == "~/" {
+	if len(path) > 1 && path[:2] == "~/" {
 		usr, _ := user.Current()
 		dir := usr.HomeDir
 

ethutil/rlp.go

@@ -137,7 +137,7 @@ func Encode(object interface{}) []byte {
 		case byte:
 			buff.Write(Encode(big.NewInt(int64(t))))
 		case *big.Int:
-			// Not sure how this is possible while we check for
+			// Not sure how this is possible while we check for nil
 			if t == nil {
 				buff.WriteByte(0xc0)
 			} else {