[443881] Handle exceptions from select() in client loop() function.

Handle exceptions from select() in client loop() function. Closes #443881.
Thanks to Jeff Jasper.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=443881
Change-Id: I4bbee80554917b61a0d413dc490370391a6fe2b5

ChangeLog.txt

@@ -11,6 +11,8 @@ v1.0.2
 - Fix possible race condition when connecting with TLS and publishing at the
   same time, which could lead to PUBLISH data being sent before any other
   messages and unencrypted. Closes #443964. Thanks to Hiram van Paassen.
+- Handle exceptions from select() in client loop() function. Closes #443881.
+  Thanks to Jeff Jasper.
 
 
 v1.0.1

src/paho/mqtt/client.py

@@ -802,6 +802,12 @@ class Client(object):
         except TypeError:
             # Socket isn't correct type, in likelihood connection is lost
             return MQTT_ERR_CONN_LOST
+        except ValueError:
+            # Can occur if we just reconnected but rlist/wlist contain a -1 for
+            # some reason.
+            return MQTT_ERR_CONN_LOST
+        except:
+            return MQTT_ERR_UNKNOWN
 
         if self.socket() in socklist[0]:
             rc = self.loop_read(max_packets)