From 9ba078870a14883cc269f98459b72293235dcd24 Mon Sep 17 00:00:00 2001
From: Zaid Abdulla <zaid@genieacs.com>
Date: Sun, 16 Jun 2019 02:24:22 -0700
Subject: [PATCH] Fix empty preconditions not firing

---
 lib/local-cache.ts | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/lib/local-cache.ts b/lib/local-cache.ts
index 366587c..13fbc88 100644
--- a/lib/local-cache.ts
+++ b/lib/local-cache.ts
@@ -158,15 +158,17 @@ async function fetchPresets(): Promise<Preset[]> {
     }
 
     const events = preset["events"] || {};
-    let precondition;
-    try {
-      precondition = parse(preset["precondition"]);
-    } catch (error) {
-      precondition = mongoQueryToFilter(JSON.parse(preset["precondition"]));
-    }
+    let precondition = true as Expression;
+    if (preset["precondition"]) {
+      try {
+        precondition = parse(preset["precondition"]);
+      } catch (error) {
+        precondition = mongoQueryToFilter(JSON.parse(preset["precondition"]));
+      }
 
-    // Simplify expression
-    precondition = expression.evaluate(precondition);
+      // Simplify expression
+      precondition = expression.evaluate(precondition);
+    }
 
     const _provisions = preset["provisions"] || [];