fix for chatty when there is oracle & openjdk installed on the machine

[NaSH]

Hello,
there is a problem with the chatty package.
if you have several java-8 installed, (openjdk & oracle) it won't run.

in a terminal, the message is (sorry in french) :
"Erreur : impossible de trouver ou charger la classe principale .usr.lib.jvm.java-8-oracle.jre.bin.java"

the problem is in the script that launch chatty, in debian/scripts/chatty in the package

JAVA_BIN=$(update-alternatives --list java | grep java-8)
this line check if there is java-8 on the machine
the pblm when you have oracle & openjdk installed, it will return :
/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
/usr/lib/jvm/java-8-oracle/jre/bin/java

which won't affect a value to $JAVA_BIN

my fix is to check if there is at least, one java-8 installed, and start chatty

#!/bin/sh
# crashes on Java 9
if [ "$(update-alternatives --list java | grep java-8| wc -l)" -gt 0 ];
then
        cd /usr/share/chatty
        java -jar chatty.jar "$@"
else
        echo "java-8 not installed, can't start chatty"
        exit
fi

[Christoph Korn (c-korn)]

Thanks for notifying me.

Fixed it a little different to make sure chatty is started with Java 8.