Less indentation

daemon.py

@@ -9734,11 +9734,17 @@ class PubServer(BaseHTTPRequestHandler):
                         GETstartTime, GETtimings: {}) -> bool:
         """Show a shared item image
         """
-        if self._pathIsImage(path):
+        if not self._pathIsImage(path):
+            self._404()
+            return True
+
         mediaStr = path.split('/sharefiles/')[1]
         mediaFilename = \
             baseDir + '/sharefiles/' + mediaStr
-            if os.path.isfile(mediaFilename):
+        if not os.path.isfile(mediaFilename):
+            self._404()
+            return True
+
         if self._etag_exists(mediaFilename):
             # The file has not changed
             self._304()
@@ -9768,8 +9774,6 @@ class PubServer(BaseHTTPRequestHandler):
                                   'show media done',
                                   'share files shown')
         return True
-        self._404()
-        return True
 
     def _showAvatarOrBanner(self, callingDomain: str, path: str,
                             baseDir: str, domain: str,