release lock on request fail

Author: respectus

logdna/logdna.py

@@ -76,6 +76,7 @@ def flush(self):
                 self.buf = self.buf + self.secondary;
                 self.secondary = [];
         except requests.exceptions.RequestException as e:
+            self.lock.release();
             logger.error('Error in request to LogDNA: ' + str(e))
 
     def emit(self, record):