reindent: try/catch subchunk logic;

ensures chunks get unlocked on throw

reindent of fc8298c468

copyparty/httpcli.py

@@ -2836,6 +2836,7 @@ class HttpCli(object):
         bail1 = False  # used in sad path to avoid contradicting error-text
         treport = time.time()  # ratelimit up2k reporting to reduce overhead
 
+        try:
             if "x-up2k-subc" in self.headers:
                 sc_ofs = int(self.headers["x-up2k-subc"])
                 chash = chashes[0]
@@ -2880,7 +2881,6 @@ class HttpCli(object):
                 hasher = None
                 final_subchunk = True
 
-        try:
             if self.args.nw:
                 path = os.devnull