A bug in function substitute_variables() when variables_mapping has multi kv.

[rihkddd]

Describe the bug

A clear and concise description of what the bug is.

Versions

Please complete the following information:

• OS: macos
• Python 2.7
• HttpRunner 1.5.15

Traceback

Traceback (most recent call last):
File "/usr/local/bin/hrun", line 11, in
sys.exit(main_hrun())
File "/usr/local/lib/python2.7/site-packages/httprunner/cli.py", line 86, in main_hrun
dot_env_path=args.dot_env_path
File "/usr/local/lib/python2.7/site-packages/httprunner/api.py", line 232, in run
testcases = loader.load_tests(path_or_testcases, dot_env_path)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 959, in load_tests
testcases = load_tests(file_path, dot_env_path)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 976, in load_tests
testcases_list = load_tests(files_list, dot_env_path)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 959, in load_tests
testcases = load_tests(file_path, dot_env_path)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 982, in load_tests
testcase = _load_testcase(raw_testcase, project_mapping)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 425, in _load_testcase
loaded_testcase["teststeps"].extend(_load_teststeps(test_block, project_mapping))
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 355, in _load_teststeps
extend_api_definition(test_block)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 348, in extend_api_definition
def_block = _get_block_by_name(ref_call, "def-api", project_mapping)
File "/usr/local/lib/python2.7/site-packages/httprunner/loader.py", line 472, in _get_block_by_name
block = parser.substitute_variables(block, args_mapping)
File "/usr/local/lib/python2.7/site-packages/httprunner/parser.py", line 240, in substitute_variables
eval_value = substitute_variables(value, variables_mapping)
File "/usr/local/lib/python2.7/site-packages/httprunner/parser.py", line 240, in substitute_variables
eval_value = substitute_variables(value, variables_mapping)
File "/usr/local/lib/python2.7/site-packages/httprunner/parser.py", line 233, in substitute_variables
for item in content
File "/usr/local/lib/python2.7/site-packages/httprunner/parser.py", line 255, in substitute_variables
content = content.replace(var, value)
AttributeError: 'int' object has no attribute 'replace'

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[debugtalk]

I can not reproduce your issue in the latest version. Please update to 2.0 and try again.

[rihkddd]

@debugtalk Sorry for the wrong test case. The proper case to produce this issue has been added. Since this function hasn't changed after my first PR, so this issue exists on 2.0 too.