Fix .- command parsing

shlr/rizin-shell-parser/corpus/simple_commands.txt

@@ -378,3 +378,14 @@ rz-find -S واسع bins/pe/testapp-msvc64.exe
       (arg (arg_identifier))
       (arg (arg_identifier))
       (arg (arg_identifier)))))
+
+===============
+.- with no args
+===============
+
+.-
+
+---
+
+(statements
+  (arged_stmt (cmd_identifier)))

shlr/rizin-shell-parser/grammar.js

@@ -262,7 +262,10 @@ module.exports = grammar({
         1,
         choice(
           seq(field("command", alias(".", $.cmd_identifier)), field("args", $._simple_stmt)),
-          seq(field("command", alias(/\.[\.:\-*]+/, $.cmd_identifier)), /[ ]+/, field("args", optional($.args))),
+          seq(
+            field("command", alias(/\.[\.:\-*]+/, $.cmd_identifier)),
+            optional(seq(/[ ]+/, field("args", optional($.args))))
+          ),
           seq(field("command", alias(/\.[ ]+/, $.cmd_identifier)), field("args", optional($.args))),
           seq(field("command", alias(".(", $.cmd_identifier)), field("args", $.macro_call_content)),
           seq(field("command", alias($._interpret_search_identifier, $.cmd_identifier)), field("args", $.args)),

shlr/rizin-shell-parser/src/grammar.json

@@ -1807,24 +1807,37 @@
                 }
               },
               {
-                "type": "PATTERN",
-                "value": "[ ]+"
-              },
-              {
-                "type": "FIELD",
-                "name": "args",
-                "content": {
-                  "type": "CHOICE",
-                  "members": [
-                    {
-                      "type": "SYMBOL",
-                      "name": "args"
-                    },
-                    {
-                      "type": "BLANK"
-                    }
-                  ]
-                }
+                "type": "CHOICE",
+                "members": [
+                  {
+                    "type": "SEQ",
+                    "members": [
+                      {
+                        "type": "PATTERN",
+                        "value": "[ ]+"
+                      },
+                      {
+                        "type": "FIELD",
+                        "name": "args",
+                        "content": {
+                          "type": "CHOICE",
+                          "members": [
+                            {
+                              "type": "SYMBOL",
+                              "name": "args"
+                            },
+                            {
+                              "type": "BLANK"
+                            }
+                          ]
+                        }
+                      }
+                    ]
+                  },
+                  {
+                    "type": "BLANK"
+                  }
+                ]
               }
             ]
           },