org-capture: Allow for no file extension on open-source protocol

* lisp/org-capture.el (org-protocol-open-source): Remove requirement
to have :online-suffix and :working-suffix.

The problem here was that two assignments expected suffix's to be
provided in org-protocol-project-alist.  When they were missing an
error occurred.  With the changes source URLs that include the file
name as-is, such as those presented by openGrok, may be opened.

TINYCHANGE

lisp/org-protocol.el

@@ -191,7 +191,7 @@ Example:
           :working-suffix \".org\"
           :base-url \"https://orgmode.org/worg/\"
           :working-directory \"/home/user/org/Worg/\")
-         (\"http://localhost/org-notes/\"
+         (\"localhost org-notes/\"
           :online-suffix \".html\"
           :working-suffix \".org\"
           :base-url \"http://localhost/org/\"
@@ -202,12 +202,17 @@ Example:
           :working-directory \"~/site/content/post/\"
           :online-suffix \".html\"
           :working-suffix \".md\"
-          :rewrites ((\"\\(https://site.com/[0-9]+/[0-9]+/[0-9]+/\\)\" . \".md\")))))
-
-
-   The last line tells `org-protocol-open-source' to open
-   /home/user/org/index.php, if the URL cannot be mapped to an existing
-   file, and ends with either \"org\" or \"org/\".
+          :rewrites ((\"\\(https://site.com/[0-9]+/[0-9]+/[0-9]+/\\)\" . \".md\")))
+         (\"GNU emacs OpenGrok\"
+          :base-url \"https://opengrok.housegordon.com/source/xref/emacs/\"
+          :working-directory \"~/dev/gnu-emacs/\")))
+
+   The :rewrites line of \"localhost org-notes\" entry tells
+   `org-protocol-open-source' to open /home/user/org/index.php,
+   if the URL cannot be mapped to an existing file, and ends with
+   either \"org\" or \"org/\".  The \"GNU emacs OpenGrok\" entry
+   does not include any suffix properties, allowing local source
+   file to be opened as found by OpenGrok.
 
 Consider using the interactive functions `org-protocol-create' and
 `org-protocol-create-for-org' to help you filling this variable with valid contents."
@@ -545,11 +550,12 @@ The location for a browser's bookmark should look like this:
 		   ;; ending than strip-suffix here:
 		   (f1 (substring f 0 (string-match "\\([\\?#].*\\)?$" f)))
                    (start-pos (+ (string-match wsearch f1) (length base-url)))
-                   (end-pos (string-match
-			     (regexp-quote strip-suffix) f1))
+                   (end-pos (if strip-suffix
+			      (string-match (regexp-quote strip-suffix) f1)
+			      (length f1)))
 		   ;; We have to compare redirects without suffix below:
 		   (f2 (concat wdir (substring f1 start-pos end-pos)))
-                   (the-file (concat f2 add-suffix)))
+                   (the-file (if add-suffix (concat f2 add-suffix) f2)))
 
 	      ;; Note: the-file may still contain `%C3' et al here because browsers
 	      ;; tend to encode `ä' in URLs to `%25C3' - `%25' being `%'.