handle invalid lock data

lib/suo/client/base.rb

@@ -123,7 +123,7 @@ module Suo
         fail NotImplementedError
       end
 
-      def initial_set(key) # rubocop:disable Lint/UnusedMethodArgument
+      def initial_set(key, val = "") # rubocop:disable Lint/UnusedMethodArgument
         fail NotImplementedError
       end
 
@@ -162,7 +162,7 @@ module Suo
         unpacked.map do |time, token|
           [Time.at(time), token]
         end
-      rescue EOFError => _
+      rescue EOFError, MessagePack::MalformedFormatError => _
         []
       end
 

lib/suo/client/memcached.rb

@@ -20,8 +20,8 @@ module Suo
         @client.set_cas(key, newval, cas)
       end
 
-      def initial_set(key)
-        @client.set(key, "")
+      def initial_set(key, val = "")
+        @client.set(key, val)
       end
     end
   end

lib/suo/client/redis.rb

@@ -32,8 +32,8 @@ module Suo
         @client.unwatch
       end
 
-      def initial_set(key)
-        @client.set(key, "")
+      def initial_set(key, val = "")
+        @client.set(key, val)
       end
     end
   end

test/client_test.rb

@@ -31,6 +31,12 @@ module ClientTests
     assert_equal false, locked
   end
 
+  def test_empty_lock_on_invalid_data
+    @client.send(:initial_set, TEST_KEY, "bad value")
+    locked = @client.locked?(TEST_KEY)
+    assert_equal false, locked
+  end
+
   def test_clear
     lock1 = @client.lock(TEST_KEY, 1)
     refute_nil lock1