[EXPORTER] Error when grpc endpoint is empty #9105

Job	Run time
CMake test (without otlp-exporter)	5m 6s
CMake clang 15 (maintainer mode, abiv2)	13m 51s
CMake clang 15 (maintainer mode, async)	14m 7s
CMake clang 15 (maintainer mode, sync)	14m 15s
CMake gcc 13 (maintainer mode, async)	6m 51s
CMake gcc 13 (maintainer mode, sync)	6m 28s
CMake msvc (maintainer mode)	7m 37s
CMake test (with abseil)	4m 20s
CMake msvc (maintainer mode) with C++20	8m 40s
CMake test (with opentracing-shim)	4m 12s
CMake C++14 test(GCC)	4m 12s
CMake C++17 test(GCC)	4m 47s
CMake C++20 test(Clang with libc++)	9m 49s
CMake C++20 test(GCC)	8m 32s
CMake C++23 test(GCC)	8m 10s
CMake test (without otlp-exporter and with async export)	4m 31s
Bazel asan config	14m 23s
Bazel noexcept	11m 43s
Bazel nortti	12m 4s
Bazel on MacOS	16m 1s
Bazel	12m 12s
Bazel with async export	12m 27s
Bazel tsan config	13m 23s
Bazel valgrind	14m 1s
Bazel with external abseil	12m 6s
Benchmark	8m 2s
CMake do not install test (with otlp-exporter)	13m 30s
CMake install test (with abseil)	4m 31s
CMake test (with modern protobuf,grpc and abseil)	18m 30s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 31s
CMake test (with otlp-exporter)	14m 37s
CMake C++23 test(Clang with libc++)	9m 4s
Code coverage	11m 56s
Copyright	5s
DocFX check	35s
Format	15s
markdown-lint	7s
misspell	3s
Plugin -> CMake	1m 22s
CMake -> exporter proto	12m 17s
Bazel Windows	22m 11s
Plugin -> CMake Windows	6m 16s
CMake (With async export) -> exporter proto	11m 52s
CMake -> exporter proto (Build as DLL)	27m 14s
	6h 59m 46s

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