👷 fixed no_exceptions test case

This test case relied on logics that have been replaced by CMake with
#461. This change enables compilation and execution of the test suite
without exceptions by adding an after_success task.

.travis.yml

@@ -78,13 +78,13 @@ matrix:
     env:
       - COMPILER=g++-4.9
       - SPECIAL=no_exceptions
-      - TEST_PATTERN=-e \"*\"
     addons:
       apt:
         sources: ['ubuntu-toolchain-r-test']
         packages: [g++-4.9, cppcheck]
-    before_script:
-      - CPPFLAGS="-DJSON_NOEXCEPTION" make
+    after_success:
+      - make clean
+      - CPPFLAGS="-DJSON_NOEXCEPTION" make check TEST_PATTERN=-e \"*\""
 
   # Coveralls (http://gronlier.fr/blog/2015/01/adding-code-coverage-to-your-c-project/)