[rpc] Remove redundant call to createExceptionResponse

[rohan-varma]

Stack from ghstack:

• [rpc] Remove redundant call to createExceptionResponse #36857 [rpc] Remove redundant call to createExceptionResponse

This was a redundant call as we immediately took the msg and converted
it back to a string

Differential Revision: D21104235

[dr-ci]

💊 Build failures summary and remediations

As of commit 617e999 (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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🕵️ 1 new failure recognized by patterns

The following build failures do not appear to be due to upstream breakages:

pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_test (1/1)

Step: "Test" (full log | pattern match details | 🔁 rerun)

Apr 18 03:13:05 RuntimeError: test_autograd failed!

Apr 18 03:13:05 Generated XML report: test-reports/python-unittest/TEST-TestAutograd-20200418030517.xml 
Apr 18 03:13:05 Generated XML report: test-reports/python-unittest/TEST-TestAutogradDeviceTypeCPU-20200418030517.xml 
Apr 18 03:13:05 Generated XML report: test-reports/python-unittest/TEST-TestAutogradDeviceTypeCUDA-20200418030517.xml 
Apr 18 03:13:05 Generated XML report: test-reports/python-unittest/TEST-TestAutogradFunctional-20200418030517.xml 
Apr 18 03:13:05 Generated XML report: test-reports/python-unittest/TEST-TestMultithreadAutograd-20200418030517.xml 
Apr 18 03:13:05 Traceback (most recent call last): 
Apr 18 03:13:05   File "test/run_test.py", line 697, in <module> 
Apr 18 03:13:05     main() 
Apr 18 03:13:05   File "test/run_test.py", line 690, in main 
Apr 18 03:13:05     raise RuntimeError(message) 
Apr 18 03:13:05 RuntimeError: test_autograd failed! 
Apr 18 03:13:06 + cleanup 
Apr 18 03:13:06 + retcode=1 
Apr 18 03:13:06 + set +x 
Apr 18 03:13:06 =================== sccache compilation log =================== 
Apr 18 03:13:06 =========== If your build fails, please take a look at the log above for possible reasons =========== 
Apr 18 03:13:06 Compile requests                 0 
Apr 18 03:13:06 Compile requests executed        0 
Apr 18 03:13:06 Cache hits                       0 
Apr 18 03:13:06 Cache misses                     0 
Apr 18 03:13:06 Cache timeouts                   0 

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This pull request has been merged in 68f847c.