[clang-tools-extra] [llvm] [clang-doc] fix bug introduced by asset test (PR #97540)

[via cfe-commits]

dyung wrote:

> @dyung I do not have access to mac for xcode could you provide me with a log of the build failure on xcode

```
% python3 ~/src/git/llvm-dyung/build/Debug/bin/llvm-lit -v basic-project.test
-- Testing: 1 tests, 1 workers --
FAIL: Clang Tools :: clang-doc/basic-project.test (1 of 1)
******************** TEST 'Clang Tools :: clang-doc/basic-project.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
Emiting docs in html format.

--
Command Output (stderr):
--
RUN: at line 1: rm -rf /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp && mkdir -p /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/docs /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/build
+ rm -rf /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp
+ mkdir -p /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/docs /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/build
RUN: at line 2: sed 's|$test_dir|/Users/dyung/src/git/llvm-dyung/clang-tools-extra/test/clang-doc|g' /Users/dyung/src/git/llvm-dyung/clang-tools-extra/test/clang-doc/Inputs/basic-project/database_template.json > /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/build/compile_commands.json
+ sed 's|$test_dir|/Users/dyung/src/git/llvm-dyung/clang-tools-extra/test/clang-doc|g' /Users/dyung/src/git/llvm-dyung/clang-tools-extra/test/clang-doc/Inputs/basic-project/database_template.json
RUN: at line 3: clang-doc --format=html --output=/Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/docs --executor=all-TUs /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/build/compile_commands.json
+ clang-doc --format=html --output=/Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/docs --executor=all-TUs /Users/dyung/src/git/llvm-dyung/build/tools/clang/tools/extra/test/clang-doc/Output/basic-project.test.tmp/build/compile_commands.json
default index.js file missing at /Users/dyung/src/git/llvm-dyung/build/Debug/bin/../share/clang-doc/index.js

```

https://github.com/llvm/llvm-project/pull/97540