gendummydata.py: Do not touch output file until we need it.

Ensures there's no leftover (empty) file if something during
initialization fails.
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

support/schema/gendummydata.py

@@ -50,11 +50,6 @@ if len(sys.argv) != 2:
 	sys.stderr.write("Missing output filename argument");
 	raise SystemExit
 
-# Just let python throw the errors if any happen
-#
-out = open(sys.argv[1], "w")
-out.write("BEGIN;\n")
-
 # make sure the seed file exists
 #
 if not os.path.exists(SEED_FILE):
@@ -177,6 +172,11 @@ trustedusers = []
 has_devs = 0
 has_tus = 0
 
+# Just let python throw the errors if any happen
+#
+out = open(sys.argv[1], "w")
+out.write("BEGIN;\n")
+
 # Begin by creating the User statements
 #
 if DBUG: print "Creating SQL statements for users.",