Update ImageManager.py - check for internet access

doDownload() - added quick internet access check before allowing user to even try and choose an image to download. Displays error if no internet connection
getImageDistro() - corrects existing check that didn't correctly catch error if specific distro website is down (or no internet access)

This was highlighted (thanks to @ccs) in below thread:
https://www.world-of-satellite.com/showthread.php?62771-5-3-025-Crash-in-Image-manage-when-downloading&p=499529&viewfull=1#post499529

src/ImageManager.py

@@ -260,10 +260,15 @@ def createSetup(self):
 		self.session.openWithCallback(self.setupDone, Setup, "viximagemanager", "SystemPlugins/ViX", self.menu_path, PluginLanguageDomain)
 
 	def doDownload(self):
-		self.choices = [("OpenViX", 1), ("OpenATV", 2), ("OpenPli",3)]
-		self.urlchoices = [config.imagemanager.imagefeed_ViX.value, config.imagemanager.imagefeed_ATV.value, config.imagemanager.imagefeed_Pli.value]
-		self.message = _("Do you want to change download url")
-		self.session.openWithCallback(self.doDownload2, MessageBox, self.message, list=self.choices, default=1, simple=True)
+		try:
+			urllib2.urlopen('http://google.co.uk', timeout=1)
+		except:
+			self.session.open(MessageBox, _("No internet connection detected!"), MessageBox.TYPE_INFO, timeout=10)
+		else:
+			self.choices = [("OpenViX", 1), ("OpenATV", 2), ("OpenPli",3)]
+			self.urlchoices = [config.imagemanager.imagefeed_ViX.value, config.imagemanager.imagefeed_ATV.value, config.imagemanager.imagefeed_Pli.value]
+			self.message = _("Do you want to change download url")
+			self.session.openWithCallback(self.doDownload2, MessageBox, self.message, list=self.choices, default=1, simple=True)
 
 	def doDownload2(self, retval):
 		if retval:
@@ -1385,8 +1390,8 @@ def getImageDistro(self):
 				try:
 					conn = urllib2.urlopen(self.urlBox)
 					html = conn.read()
-				except urllib2.HTTPError as e:
-					print "[ImageManager] HTTP download ERROR: %s" % e.code
+				except:
+					print "[ImageManager] HTTP download ERROR: " + self.urlBox
 					continue
 				soup = BeautifulSoup(html)
 				links = soup.find_all("a")