install handles null response as no, rather than getting an error

install.sh

@@ -9,12 +9,15 @@ if [ -d "/etc/profile.d" ]; then
 else
     echo "Your distribution does not have a /etc/profile.d directory, the default that we install one of the scripts to. Would you like us to copy it into your ~/.bashrc file to make it work? (If you have done this once before, delete the old version before doing it again.) [y/n]"
     read ans
-    if [ $ans = "y" -o $ans = "Y" -o $ans = "yes" -o $ans = "Yes" ]; then
-	echo "" >> ~/.bashrc
-	echo "#autojump" >> ~/.bashrc
-	cat autojump.sh >> ~/.bashrc
+    if [ ${#ans} -gt 0 ]; then
+	if [ $ans = "y" -o $ans = "Y" -o $ans = "yes" -o $ans = "Yes" ]; then
+	    echo "" >> ~/.bashrc
+	    echo "#autojump" >> ~/.bashrc
+	    cat autojump.sh >> ~/.bashrc
+	else
+	    echo "Then you need to put autojump.sh, or the code from it, somewhere where it will get read. Good luck!"
+	fi
     else
-	echo "Then you need to put autojump.sh, or the code from it, somewhere where it will get read. Good luck!"
+    	    echo "Then you need to put autojump.sh, or the code from it, somewhere where it will get read. Good luck!"
     fi
-    
 fi