<no keywords defined>搜集问题

[yimengfan]

 if (curSnippet != null && line.StartsWith(ShaderParsedCombinations.TAG_NO_KEYWORDS_DEFINED))
      {
          if (curSnippet.variants != null)
          {
              curSnippet.variants = null;
          }
      }
      //变体
      else if (curSnippet != null && curSnippet.variants != null)
      {
          var keywords = keywordsSpliter(line);
          if (keywords != null)
          {
              curSnippet.variants.Add(keywords);
          }
      }

// Snippet #6 platforms ffffffff:
Keywords always included into build: FOG_LINEAR FOG_EXP FOG_EXP2 INSTANCING_ON
Builtin keywords used: LIGHTPROBE_SH DYNAMICLIGHTMAP_ON SHADOWS_SHADOWMASK LIGHTMAP_ON DIRLIGHTMAP_COMBINED UNITY_HDR_ON

4 keyword variants used in scene:

<no keywords defined>
LIGHTPROBE_SH
UNITY_HDR_ON
LIGHTPROBE_SH UNITY_HDR_ON

// -----------------------------------------

这里 curSnippet.variants 会导致后面的搜集不到 ，应该遇到 直接add（“”）; 表示shader本体