quteproc: see lines starting with ' ' as error

Now that json logging is used, multiple lines should be correctly
escaped (and parsed), even in tracebacks, so this check should now be
obsolete.

tests/end2end/fixtures/quteprocess.py

@@ -176,10 +176,7 @@ class QuteProc(testprocess.Process):
         try:
             log_line = LogLine(line)
         except testprocess.InvalidLine:
-            if line.startswith('  '):
+            if not line.strip():
-                # Multiple lines in some log output...
-                return None
-            elif not line.strip():
                 return None
             elif is_ignored_qt_message(line):
                 return None