added try test to make sure i2c bus is enabled

python/voltcurrent.py

@@ -27,6 +27,7 @@ if __name__ == "__main__":
   addresses = [0x40, 0x41, 0x44, 0x45] #INA219 addresses on the bus
 #  print("buses: ", buses, " addr: ", addresses)
   for x in buses:
+    try:
       i2c_bus = I2C(x) # Device is /dev/i2c-x
       for y in addresses:
  #     print(x,y)
@@ -59,5 +60,7 @@ if __name__ == "__main__":
           print("{:6.3f} ".format(bus_voltage), "{:6.3f} ".format(current) , end = '')    
         except:
           print("{:6.3f} ".format(0),  "{:6.3f} ".format(0), end = '')
+    except:
+      print("{:6.3f} ".format(0),  "{:6.3f} ".format(0), end = '')   
 #        pass
   print(" ")