mshtml/tests: skip some tests if gecko isn't installed

[Jacek Caban]

Austin English wrote:

-    ok(hres == S_OK, "get_body failed: %08x\n", hres);
+    if(hres == E_UNEXPECTED) {
+        skip("Could not get document body. Assuming no Gecko installed.\n");
+    }
+    else {
+        ok(hres == S_OK, "get_body failed: %08x\n", hres);
+    }


You should fix existing skip to mach current mshtml changes, not add 
another one.


Jacek