[qa] test_framework: Properly print exceptions and assert empty dict

qa/rpc-tests/test_framework/test_framework.py

@@ -146,7 +146,7 @@ class BitcoinTestFramework(object):
             print("key not found: "+ str(e))
             traceback.print_tb(sys.exc_info()[2])
         except Exception as e:
-            print("Unexpected exception caught during testing: "+str(e))
+            print("Unexpected exception caught during testing: " + repr(e))
             traceback.print_tb(sys.exc_info()[2])
 
         if not self.options.noshutdown:

qa/rpc-tests/test_framework/util.py

@@ -487,7 +487,7 @@ def assert_array_result(object_array, to_match, expected, should_not_find = Fals
         in object_array
         """
     if should_not_find == True:
-        expected = { }
+        assert_equal(expected, { })
     num_matched = 0
     for item in object_array:
         all_match = True