From 05da8894b9f98a24e4e21b038ea15409e72067fd Mon Sep 17 00:00:00 2001
From: sauls8t <saul@documize.com>
Date: Thu, 26 Apr 2018 15:14:41 +0100
Subject: [PATCH] Trap for empty text diagram before generating

---
 domain/section/plantuml/plantuml.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/domain/section/plantuml/plantuml.go b/domain/section/plantuml/plantuml.go
index 0fc9dfb9..64c7f4da 100644
--- a/domain/section/plantuml/plantuml.go
+++ b/domain/section/plantuml/plantuml.go
@@ -74,8 +74,13 @@ func (p *Provider) Command(ctx *provider.Context, w http.ResponseWriter, r *http
 			return
 		}
 
-		diagram := p.generateDiagram(ctx, payload.Data)
+		// Generate diagram if we have data.
+		var diagram string
+		if len(payload.Data) > 0 {
+			diagram = p.generateDiagram(ctx, payload.Data)
+		}
 		payload.Data = diagram
+
 		provider.WriteJSON(w, payload)
 		return
 	}