[clang] [clang-format] Fix crashes when the macro expansion is empty (PR #119428)

[Owen Pan via cfe-commits]

================
@@ -0,0 +1,5 @@
+// RUN: grep -Ev "// *[A-Z-]+:" %s | clang-format -style="{Macros: [A(x)=x]}" \
+// RUN:   | FileCheck -strict-whitespace %s
+
+// CHECK: A()
+A()
----------------
owenca wrote:

Don't add a lit test. Instead, add a unittest similar to the  one you already 
added there.

https://github.com/llvm/llvm-project/pull/119428
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