Prevent running crossfire.lua if crossfire not available

Checks if crossfire is available before running crossfire.lua. Exits the script and shows an error message if not.

radio/sdcard/horus/SCRIPTS/TOOLS/crossfire.lua

@@ -30,6 +30,11 @@ local function run(event)
     return 2
   end
 
+  if crossfireTelemetryPush() == nil then
+    error("Crossfire not available!")
+    return 2
+  end
+
   chdir("/SCRIPTS/TOOLS/CROSSFIRE")
   return "crossfire.lua"
 end

radio/sdcard/taranis-x7/SCRIPTS/TOOLS/crossfire.lua

@@ -30,6 +30,11 @@ local function run(event)
     return 2
   end
 
+  if crossfireTelemetryPush() == nil then
+    error("Crossfire not available!")
+    return 2
+  end
+  
   chdir("/SCRIPTS/TOOLS/CROSSFIRE")
   return "crossfire.lua"
 end

radio/sdcard/taranis-x9/SCRIPTS/TOOLS/crossfire.lua

@@ -30,6 +30,11 @@ local function run(event)
     return 2
   end
 
+  if crossfireTelemetryPush() == nil then
+    error("Crossfire not available!")
+    return 2
+  end
+
   chdir("/SCRIPTS/TOOLS/CROSSFIRE")
   return "crossfire.lua"
 end