Correct an issue on the latest commit, cause unitary tests failed

glances/plugins/glances_hddtemp.py

@@ -92,7 +92,7 @@ class GlancesGrabHDDTemp(object):
         self.reset()
 
         # Only update if --disable-hddtemp is not set
-        if self.args.disable_hddtemp:
+        if self.args is None or self.args.disable_hddtemp:
             return
 
         # Fetch the data

unitest.py

@@ -78,14 +78,14 @@ class TestGlances(unittest.TestCase):
         print('INFO: [TEST_000] Test the stats update function')
         try:
             stats.update()
-        except:
-            print('ERROR: Stats update failed')
+        except Exception as e:
+            print('ERROR: Stats update failed ({})'.format(e))
             self.assertTrue(False)
         time.sleep(1)
         try:
             stats.update()
-        except:
-            print('ERROR: Stats update failed')
+        except Exception as e:
+            print('ERROR: Stats update failed ({})'.format(e))
             self.assertTrue(False)
 
         self.assertTrue(True)