Update other modules just for consistency

tools/test_modules/m00000.pm

@@ -32,6 +32,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq $hash;
 
   return $new_hash;

tools/test_modules/m00100.pm

@@ -32,6 +32,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq $hash;
 
   return $new_hash;

tools/test_modules/m00110.pm

@@ -34,6 +34,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word, $salt);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq "$hash:$salt";
 
   return $new_hash;

tools/test_modules/m00120.pm

@@ -34,6 +34,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word, $salt);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq "$hash:$salt";
 
   return $new_hash;

tools/test_modules/m18400.pm

@@ -102,6 +102,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word, $salt, $iter, $iv, $plain);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq $hash;
 
   return $new_hash;

tools/test_modules/m18600.pm

@@ -128,6 +128,8 @@ sub module_verify_hash
 
   my $new_hash = module_generate_hash ($word, $salt, $iter, $iv, $plain);
 
+  return unless defined $new_hash;
+
   return unless $new_hash eq $hash;
 
   return $new_hash;