qtvcp -istat: fix error when designer run because there is no real INI

qtplasmac check failed if there was no entry at all

Author: c-morley

lib/python/qtvcp/qt_istat.py

@@ -109,8 +109,10 @@ def update(self):
             self.MACRO_PATH = None
         self.INI_MACROS = self.INI.findall("DISPLAY", "MACRO")
         self.MACHINE_IS_LATHE = bool(self.INI.find("DISPLAY", "LATHE"))
-        self.MACHINE_IS_QTPLASMAC = 'qtplasmac' in self.INI.find("DISPLAY", "DISPLAY")
-
+        try:
+            self.MACHINE_IS_QTPLASMAC = 'qtplasmac' in self.INI.find("DISPLAY", "DISPLAY")
+        except:
+            self.MACHINE_IS_QTPLASMAC = False
         extensions = self.INI.findall("FILTER", "PROGRAM_EXTENSION")
         self.PROGRAM_FILTERS = ([e.split(None, 1) for e in extensions]) or None
         self.PROGRAM_FILTERS_EXTENSIONS = self.get_filters_extensions()