CF#448: Protect RemoveWaypoint() from non-table inputs.

diff --git a/TomTom.lua b/TomTom.lua
index c6fea07..2fe1c43 100755
--- a/TomTom.lua
+++ b/TomTom.lua
@@ -656,6 +656,7 @@ function TomTom:InitializeDropdown(uid)
 end

 function TomTom:UIDIsSaved(uid)
+    if type(uid) ~= "table" then error("TomTom:UIDIsSaved(uid) UID is not a table."); end
     local data = uid
     if data then
         local key = TomTom:GetKey(data)
@@ -669,6 +670,7 @@ function TomTom:UIDIsSaved(uid)
 end

 function TomTom:SendWaypoint(uid, channel)
+    if type(uid) ~= "table" then error("TomTom:SendWaypoint(uid) UID is not a table."); end
     local data = uid
     local m, x, y = unpack(data)
     local msg = string.format("%d:%f:%f:%s", m, x, y, data.title or "")
@@ -783,6 +785,7 @@ end
 local function noop() end

 function TomTom:RemoveWaypoint(uid)
+    if type(uid) ~= "table" then error("TomTom:RemoveWaypoint(uid) UID is not a table."); end
     local data = uid
     self:ClearWaypoint(uid)

@@ -937,6 +940,7 @@ end

 -- Check to see if a given uid/waypoint is actually set somewhere
 function TomTom:IsValidWaypoint(waypoint)
+    if type(waypoint) ~= "table" then error("TomTom:IsValidWaypoint(waypoint) UID is not a table."); end
     local m = waypoint[1]
     local key = self:GetKey(waypoint)
     if waypoints[m] and waypoints[m][key] then