Hi,
I have a problem with the markdown plugin.
The preview panel doesn't show any output.
I have configured the file type as Markdown

I installed the plugin cloning the this repo
Some info
Geany version: 1.36
Geany plugins from github master branch (commit 0bfe89d)
OS: Ubuntu 18.04.3 LTS
Output of Debug Messages:

14:51:19: Geany INFO		: Geany 1.36, it_IT.UTF-8
14:51:19: Geany INFO		: GTK 3.22.30, GLib 2.56.4
14:51:19: Geany INFO		: System data dir: /usr/share/geany
14:51:19: Geany INFO		: User config dir: /home/mirko/.config/geany
14:51:19: Geany INFO		: Loaded GTK+ CSS theme '/usr/share/geany/geany.css'
14:51:19: Geany INFO		: Loaded GTK+ CSS theme '/usr/share/geany/geany-3.20.css'
14:51:19: Geany INFO		: System plugin path: /usr/lib/i386-linux-gnu/geany
14:51:19: Geany INFO		: Added filetype Arduino (61).
14:51:19: Geany INFO		: Added filetype TypeScript (62).
14:51:19: Geany INFO		: Added filetype Scala (63).
14:51:19: Geany INFO		: Added filetype Kotlin (64).
14:51:19: Geany INFO		: Added filetype Genie (65).
14:51:19: Geany INFO		: Added filetype JSON (66).
14:51:19: Geany INFO		: Added filetype Swift (67).
14:51:19: Geany INFO		: Added filetype Groovy (68).
14:51:19: Geany INFO		: Added filetype Nim (69).
14:51:19: Geany INFO		: Added filetype Cython (70).
14:51:19: Geany INFO		: Added filetype Clojure (71).
14:51:19: Geany INFO		: Added filetype Graphviz (72).
14:51:19: Geany INFO		: Added filetype CUDA (73).
14:51:20: Geany INFO		: Loaded libvte from libvte-2.91.so.0
14:51:20: Geany INFO		: Loaded:   /usr/lib/i386-linux-gnu/geany/pairtaghighlighter.so (Coppia tag Highlighter)
14:51:20: Geany INFO		: /mnt/DATI/MIRKO/pwd : None (UTF-8)
14:51:23: Geany INFO		: unknown : None (UTF-8)
16:35:56: Geany INFO		: unknown : None (UTF-8)
16:47:27: Geany INFO		: Plugin "/usr/lib/i386-linux-gnu/geany/pairtaghighlighter.so" already loaded.
16:47:27: Geany INFO		: Added 8 plugin(s) in '/usr/lib/i386-linux-gnu/geany'.
16:47:27: Gtk CRITICAL	: gtk_widget_get_preferred_width_for_height: assertion 'height >= 0' failed
16:47:30: Geany INFO		: Loaded:   /usr/lib/i386-linux-gnu/geany/markdown.so (Markdown)
16:47:30: Geany INFO		: Unloaded: /usr/lib/i386-linux-gnu/geany/markdown.so
16:47:30: Markdown CRITICAL	: markdown_config_get_template_text: assertion 'conf' failed
16:47:30: GLib-GObject WARNING	: invalid unclassed pointer in cast to 'GtkWidget'
16:47:30: Gtk CRITICAL	: gtk_widget_get_parent: assertion 'GTK_IS_WIDGET (widget)' failed
16:47:30: GLib-GObject WARNING	: invalid unclassed pointer in cast to 'WebKitWebView'
16:47:30: GLib-GObject WARNING	: instance with invalid (NULL) class pointer
16:47:30: GLib-GObject CRITICAL	: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
16:47:30: GLib-GObject WARNING	: invalid unclassed pointer in cast to 'WebKitWebView'
16:47:30: (null) CRITICAL	: void webkit_web_view_load_html(WebKitWebView*, const gchar*, const gchar*): assertion 'WEBKIT_IS_WEB_VIEW(webView)' failed
16:47:32: Geany INFO		: Loaded:   /usr/lib/i386-linux-gnu/geany/markdown.so (Markdown)
16:47:38: Geany INFO		: unknown : None (UTF-8)
16:48:33: Geany INFO		: unknown : Markdown (UTF-8)

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