[EXPORTER] Error when grpc endpoint is empty #9132

Job	Run time
CMake gcc 13 (maintainer mode, async)	6m 38s
CMake test (without otlp-exporter)	4m 54s
CMake test (with abseil)	4m 44s
CMake clang 15 (maintainer mode, abiv2)	13m 52s
CMake clang 15 (maintainer mode, async)	14m 16s
CMake clang 15 (maintainer mode, sync)	14m 43s
CMake gcc 13 (maintainer mode, sync)	7m 54s
CMake msvc (maintainer mode)	8m 22s
CMake msvc (maintainer mode) with C++20	8m 48s
CMake test (without otlp-exporter and with async export)	4m 41s
Bazel	12m 26s
Bazel with async export	12m 0s
CMake do not install test (with otlp-exporter)	14m 23s
CMake install test (with abseil)	4m 22s
CMake test (with opentracing-shim)	4m 8s
CMake test (with modern protobuf,grpc and abseil)	18m 32s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 14s
CMake test (with otlp-exporter)	14m 18s
CMake C++14 test(GCC)	3m 55s
CMake C++17 test(GCC)	4m 21s
CMake C++20 test(Clang with libc++)	9m 20s
CMake C++20 test(GCC)	8m 33s
CMake C++23 test(Clang with libc++)	9m 26s
CMake C++23 test(GCC)	8m 52s
Plugin -> CMake	1m 0s
Bazel asan config	14m 20s
Bazel noexcept	12m 1s
Bazel nortti	12m 22s
Bazel on MacOS	35m 30s
Bazel tsan config	12m 43s
Bazel valgrind	13m 25s
Bazel with external abseil	12m 19s
Benchmark	7m 49s
Code coverage	11m 21s
Copyright	4s
Format	11s
markdown-lint	5s
CMake -> exporter proto	12m 17s
Bazel Windows	18m 57s
Plugin -> CMake Windows	6m 57s
CMake (With async export) -> exporter proto	13m 41s
CMake -> exporter proto (Build as DLL)	26m 24s
DocFX check	58s
misspell	3s
	7h 19m 9s

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