Fix build with Clang on Windows

src/blackmisc/atomicfile.cpp

@@ -71,6 +71,16 @@ namespace BlackMisc
         return ok;
     }
 
+    CAtomicFile::~CAtomicFile()
+    {
+#if __cplusplus >= 201700L
+        const bool ex = std::uncaught_exceptions() > 0;
+#else
+        const bool ex = std::uncaught_exception();
+#endif
+        if (ex) { QFile::close(); }
+    }
+
     void CAtomicFile::close()
     {
         if (! isOpen()) { return; }