Be more tolerant of corrupted or truncated flows.

We load as far as possible. mitmproxy will only terminate if it was not able to
recover any flows. mitmdump will stop loading as soon as an error is
encountered, but not exit with an error.

libmproxy/console/__init__.py

@@ -548,7 +548,9 @@ class ConsoleMaster(flow.FlowMaster):
 
         if self.options.rfile:
             ret = self.load_flows(self.options.rfile)
-            if ret:
+            if ret and self.state.flow_count():
+                self.add_event("File truncated or corrupted. Loaded as many flows as possible.")
+            else:
                 self.shutdown()
                 print >> sys.stderr, "Could not load file:", ret
                 sys.exit(1)
@@ -653,14 +655,16 @@ class ConsoleMaster(flow.FlowMaster):
             fr = flow.FlowReader(f)
         except IOError, v:
             return v.strerror
+        reterr = None
         try:
             flow.FlowMaster.load_flows(self, fr)
         except flow.FlowReadError, v:
-            return v.strerror
+            reterr = v.strerror
         f.close()
         if self.flow_list_walker:
             self.sync_list_view()
             self.focus_current()
+        return reterr
 
     def path_prompt(self, prompt, text, callback, *args):
         self.statusbar.path_prompt(prompt, text)