msi: Ignore min/max versions if their values are null.

dlls/msi/upgrade.c

@@ -151,27 +151,31 @@ static UINT ITERATE_FindRelatedProducts(MSIRECORD *rec, LPVOID param)
                     (LPBYTE)&check, &sz);
             /* check min */
             ver = MSI_RecordGetString(rec,2);
+            if (ver)
+            {
                 comp_ver = msi_version_str_to_dword(ver);
                 r = check - comp_ver;
-            if (r < 0 || (r == 0 && !(attributes &
-                                    msidbUpgradeAttributesVersionMinInclusive)))
+                if (r < 0 || (r == 0 && !(attributes & msidbUpgradeAttributesVersionMinInclusive)))
                 {
                     RegCloseKey(hukey);
                     index ++;
                     continue;
                 }
+            }
 
             /* check max */
             ver = MSI_RecordGetString(rec,3);
+            if (ver)
+            {
                 comp_ver = msi_version_str_to_dword(ver);
                 r = check - comp_ver;
-            if (r > 0 || (r == 0 && !(attributes & 
-                                    msidbUpgradeAttributesVersionMaxInclusive)))
+                if (r > 0 || (r == 0 && !(attributes & msidbUpgradeAttributesVersionMaxInclusive)))
                 {
                     RegCloseKey(hukey);
                     index ++;
                     continue;
                 }
+            }
 
             /* check language*/
             sz = sizeof(DWORD);