[clang] [analyzer] Fix tests broken by empty %z3_include_dir (PR #146042)

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``````````bash
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``````````diff
--- lit.cfg.py	2025-06-27 09:22:29.000000 +0000
+++ lit.cfg.py	2025-06-27 09:26:11.277653 +0000
@@ -178,13 +178,11 @@
         config.available_features.add("z3")
         if config.clang_staticanalyzer_z3_include_dir:
             I_z3_include_dir = '-I "%s"' % config.clang_staticanalyzer_z3_include_dir
     else:
         config.available_features.add("no-z3")
-    config.substitutions.append(
-        ("%I_z3_include_dir", I_z3_include_dir)
-    )
+    config.substitutions.append(("%I_z3_include_dir", I_z3_include_dir))
 
     check_analyzer_fixit_path = os.path.join(
         config.test_source_root, "Analysis", "check-analyzer-fixit.py"
     )
     config.substitutions.append(

``````````

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https://github.com/llvm/llvm-project/pull/146042