-100 for nonexistent sensor

controller/drivers/onewire/__init__.py

@@ -1,20 +1,25 @@
 import re
 
 def read_one_thermo(filename):
-    NO_OF_DECIMALS = 3
-    textfile = open(filename, 'r')
-    filetext = textfile.read()
-    textfile.close()
+    try:
+        NO_OF_DECIMALS = 3
+        textfile = open(filename, 'r')
+        filetext = textfile.read()
+        textfile.close()
 
-    matches = re.findall("t=(\-?)(\d+)", filetext)
-    sign = -1 if matches[0][0] == '-' else 1
-    whole_reading = matches[0][1]
-    first_part = matches[0][1][0:-NO_OF_DECIMALS]
-    second_part = matches[0][1][-NO_OF_DECIMALS:]
-    first_part = '0' if first_part == '' else first_part
-
-    return  (int(first_part)  +  (int(second_part) / (10.0 ** NO_OF_DECIMALS) )) * sign
+        matches = re.findall("t=(\-?)(\d+)", filetext)
+        sign = -1 if matches[0][0] == '-' else 1
+        whole_reading = matches[0][1]
+        first_part = matches[0][1][0:-NO_OF_DECIMALS]
+        second_part = matches[0][1][-NO_OF_DECIMALS:]
+        first_part = '0' if first_part == '' else first_part
 
+        return  (int(first_part)  +  (int(second_part) / (10.0 ** NO_OF_DECIMALS) )) * sign
+    except Exception as e:
+        print 'errror'
+        print e
+        return -100.0
+        
 def read_many_thermo(filenames):
     result = []
     for filename in list(filenames):