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	Fix object does not exist error when checking citation file (#28314)
Fix #28264 `DataAsync()` will be called twice. Caused by https://github.com/go-gitea/gitea/pull/27958. I'm sorry, I didn't completely remove all unnecessary codes.
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		@@ -711,21 +711,14 @@ func checkCitationFile(ctx *context.Context, entry *git.TreeEntry) {
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	}
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	for _, entry := range allEntries {
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		if entry.Name() == "CITATION.cff" || entry.Name() == "CITATION.bib" {
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			ctx.Data["CitiationExist"] = true
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			// Read Citation file contents
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			blob := entry.Blob()
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			dataRc, err := blob.DataAsync()
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			if err != nil {
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				ctx.ServerError("DataAsync", err)
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				return
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			if content, err := entry.Blob().GetBlobContent(setting.UI.MaxDisplayFileSize); err != nil {
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				log.Error("checkCitationFile: GetBlobContent: %v", err)
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			} else {
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				ctx.Data["CitiationExist"] = true
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				ctx.PageData["citationFileContent"] = content
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				break
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			}
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			defer dataRc.Close()
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			ctx.PageData["citationFileContent"], err = blob.GetBlobContent(setting.UI.MaxDisplayFileSize)
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			if err != nil {
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				ctx.ServerError("GetBlobContent", err)
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				return
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			}
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			break
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		}
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	}
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}
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