fix(plugin): fix url based plugin name and added extra safety checks. F…

…ixes #824

lua/lazy/core/plugin.lua

@@ -49,6 +49,7 @@ end
 -- PERF: optimized code to get package name without using lua patterns
 function Spec.get_name(pkg)
   local name = pkg:sub(-4) == ".git" and pkg:sub(1, -5) or pkg
+  name = name:sub(-1) == "/" and name:sub(1, -2) or name
   local slash = name:reverse():find("/", 1, true) --[[@as number?]]
   return slash and name:sub(#name - slash + 2) or pkg:gsub("%W+", "_")
 end
@@ -109,6 +110,11 @@ function Spec:add(plugin, results, is_dep)
     return
   end
 
+  if not plugin.name or plugin.name == "" then
+    self:error("Plugin spec " .. vim.inspect(plugin) .. " has no name")
+    return
+  end
+
   if type(plugin.config) == "table" then
     self:warn(
       "{" .. plugin.name .. "}: setting a table to `Plugin.config` is deprecated. Please use `Plugin.opts` instead"