mshtml/tests: skip tests if gecko is not available

[Austin English]

-- 
-Austin
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diff --git a/dlls/mshtml/tests/dom.c b/dlls/mshtml/tests/dom.c
index ae24bcf..c1c9fa8 100644
--- a/dlls/mshtml/tests/dom.c
+++ b/dlls/mshtml/tests/dom.c
@@ -4198,10 +4198,9 @@ static void run_domtest(const char *str, domtest_t test)
         DispatchMessage(&msg);
     }
 
-    hres = IHTMLDocument2_get_body(doc, &body);
-    ok(hres == S_OK, "get_body failed: %08x\n", hres);
-
     if(body) {
+        hres = IHTMLDocument2_get_body(doc, &body);
+        ok(hres == S_OK, "get_body failed: %08x\n", hres);
         IHTMLElement_Release(body);
         test(doc);
     }else {