add type check before applying 'browser' option (fixes #1358)

gallery_dl/extractor/common.py

@@ -216,7 +216,7 @@ class Extractor():
         headers.clear()
 
         browser = self.config("browser") or self.browser
-        if browser:
+        if browser and isinstance(browser, str):
             browser, _, platform = browser.lower().partition(":")
 
             if not platform or platform == "auto":

gallery_dl/version.py

@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.17.0"
+__version__ = "1.17.1-dev"