Added a check for the roll mod value, before tring to append it's

information onto the roll text view

closes #20

Signed-off-by: Ricky Barrette <rickbarrette@gmail.com>

ExaltedDice/src/com/TwentyCode/android/ExaltedDice/RollHistoryDatabaseAdapter.java

@@ -95,7 +95,7 @@ public class RollHistoryDatabaseAdapter extends BaseAdapter {
         
         holder.mRoll.setText("Rolled: "+roll.getAsInteger(Database.KEY_NUMBER) + " "+roll.getAsString(Database.KEY_D_TYPE));
         
-        if(isRollModEnabled)
+        if(isRollModEnabled && roll.containsKey(Database.KEY_MOD))
         	holder.mRoll.append(" "+ roll.getAsString(Database.KEY_MOD).replace("'", ""));
         
         holder.mStats.setText(roll.getAsString(Database.KEY_LOG));