qtvcp -istat: add function to return floats or ints from INI

if you just wrap the INI find function by float() it fails if there is no entry.
Now you can set what it will return if etry not found

Author: c-morley

lib/python/qtvcp/qt_istat.py

@@ -518,7 +518,8 @@ def update(self):
     ###################
     # helper functions
     ###################
-
+    # return a found string or else None by default, anything else by option
+    # since this is used in this file there are some workarounds for plasma machines
     def get_error_safe_setting(self, heading, detail, default=None):
         result = self.INI.find(heading, detail)
         if result:
@@ -531,6 +532,22 @@ def get_error_safe_setting(self, heading, detail, default=None):
                 log.warning('INI Parsing Error, No {} Entry in {}, Using: {}'.format(detail, heading, default))
             return default
 
+    # return a found float or else None by default, anything else by option
+    def get_safe_float(self, heading, detail, default=None):
+        try:
+            result = float(self.INI.find(heading, detail))
+            return result
+        except:
+            return default
+
+    # return a found integer or else None by default, anything else by option
+    def get_safe_int(self, heading, detail, default=None):
+        try:
+            result = int(self.INI.find(heading, detail))
+            return result
+        except:
+            return default
+
     def convert_machine_to_metric(self, data):
         if self.MACHINE_IS_METRIC:
             return data