Cleaner mkpuzzles output

doc/problems.txt

@@ -1,3 +1,2 @@
 * claim.cgi not exiting (maybe fixed?)
 * get LAUR for contest
-* steg point values

mkpuzzles

@@ -96,18 +96,21 @@ for dn in $indir/[0-9]*; do
     fi
 
     # Append keys 
-    if ! [ -f $dn/key ]; then
-        echo "$dn/key: No such file or directory" 1>&2
-        exit 1
-    fi
+    if [ -f $dn/key ]; then
         while read answer; do
             echo $points $answer >> $uanswers
         done < $dn/key
+    else
+        echo "$dn/key: No such file or directory" 1>&2
+        exit 1
+    fi
 
     # Append summary
+    if [ -f $dn/summary ]; then
         while read line; do
             echo $points $line >> $usummary
         done < $dn/summary
+    fi
 
     # Generate index now that we have a list of files
     if [ -f $dn/index.mdwn ]; then