gemini: make it clear that empty CN is OK

Will it be OK for all servers though? We might never know…

bebop/browser/browser.py

@@ -388,11 +388,18 @@ class Browser:
         elif command == "set-render-mode":
             self.set_render_mode(words[1])
 
-    def get_user_text_input(self, status_text, char, prefix="", strip=False):
+    def get_user_text_input(self, status_text, char, prefix="", strip=False,
+                            escape_to_none=False):
         """Get user input from the command-line."""
         self.set_status(status_text)
-        result = self.command_line.focus(char, prefix=prefix)
+        result = self.command_line.focus(
+            char,
+            prefix=prefix,
+            escape_to_none=escape_to_none
+        )
         self.reset_status()
+        if result is None:
+            return None
         if strip:
             result = result.strip()
         return result

bebop/browser/gemini.py

@@ -332,11 +332,12 @@ def create_identity(browser: Browser, url: str, reason: Optional[str] =None):
         return None
 
     common_name = browser.get_user_text_input(
-        "Name? The server will see this, you can leave it empty.",
+        "Name? The server may use it as your username.",
         CommandLine.CHAR_TEXT,
         strip=True,
+        escape_to_none=True
     )
-    if not common_name:
+    if common_name is None:
         browser.reset_status()
         return None