[clang-tidy] Don't generate duplicated blank line in add_new_check.py script.

[alexfh]

LG. I'll submit the patch for you.

clang-tools-extra/trunk/clang-tidy/add_new_check.py

public:
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
 };
 
 } // namespace %(module)s
 } // namespace tidy
 } // namespace clang
 
 #endif // %(header_guard)s
-
 """ % {'header_guard': header_guard,
        'check_name': check_name_camel,
        'check_name_dashes': check_name_dashes,
        'module': module})
 
 
 # Adds the implementation of the new check.
 def write_implementation(module_path, module, check_name_camel):
void %(check_name)s::check(const MatchFinder::MatchResult &Result) {
   diag(MatchedDecl->getLocation(), "function '%%0' is insufficiently awesome")
       << MatchedDecl->getName()
       << FixItHint::CreateInsertion(MatchedDecl->getLocation(), "awesome_");
 }
 
 } // namespace %(module)s
 } // namespace tidy
 } // namespace clang
-
 """ % {'check_name': check_name_camel,
        'module': module})
 
 
 # Modifies the module to include the new check.
 def adapt_module(module_path, module, check_name, check_name_camel):
   modulecpp = filter(lambda p: p.lower() == module.lower() + "tidymodule.cpp", os.listdir(module_path))[0]
   filename = os.path.join(module_path, modulecpp)