make sure to always clean up the bjam xml file

tools/run_tests.py

@@ -80,6 +80,7 @@ def svn_info():
 
 def run_tests(toolset, tests, features, options, test_dir, time_limit, incremental):
 	xml_file = 'bjam_build.%d.xml' % random.randint(0, 100000)
+	try:
 
 		results = {}
 		toolset_found = False
@@ -124,9 +125,6 @@ def run_tests(toolset, tests, features, options, test_dir, time_limit, increment
 					toolset = compiler + '-' + compiler_version
 			except: pass
    
-		try: os.unlink(xml_file)
-		except: pass
-
 			r = { 'status': p.returncode, 'output': output, 'command': command }
 			results[t + '|' + features] = r
    
@@ -143,6 +141,10 @@ def run_tests(toolset, tests, features, options, test_dir, time_limit, increment
 			else: sys.stdout.write('X')
 			sys.stdout.flush()
 
+	finally:
+		try: os.unlink(xml_file)
+		except: pass
+
 	return (toolset, results)
 
 def print_usage():