fixed crash on reading broken Xorg log

pym/calculate/lib/utils/common.py

@@ -306,9 +306,12 @@ def getVideoFromXorgLog(prefix="/", available_drivers=()):
             xorg_log_file = path.join(prefix, 'var/log/Xorg.%s.log' %
                                       display_number.group(1))
             if path.exists(xorg_log_file):
-                matchStrs = [x.group(1) for x in [reDriverName.search(y) 
-                    for y in readLinesFile(xorg_log_file) 
-                        if "drv" in y and reDriver.search(y)] if x]
+                try:
+                    matchStrs = [x.group(1) for x in [reDriverName.search(y) 
+                        for y in readLinesFile(xorg_log_file) 
+                            if "drv" in y and reDriver.search(y)] if x]
+                except UnicodeDecodeError as e:
+                    return ""
                 if matchStrs:
                     reUnload = re.compile('UnloadModule: "(%s)"' %'|'.join(x
                         for x in matchStrs))