AddonManager: Further older ssl/urllib2 version support

src/Mod/AddonManager/AddonManager.py

@@ -353,7 +353,10 @@ def __init__(self):
     def run(self):
         "populates the list of addons"
         self.progressbar_show.emit(True)
-        u = urllib2.urlopen("https://github.com/FreeCAD/FreeCAD-addons",context=ctx)
+        if ctx:
+            u = urllib2.urlopen("https://github.com/FreeCAD/FreeCAD-addons",context=ctx)
+        else:
+            u = urllib2.urlopen("https://github.com/FreeCAD/FreeCAD-addons")
         p = u.read()
         if sys.version_info.major >= 3 and isinstance(p, bytes):
             p = p.decode("utf-8")
@@ -397,7 +400,10 @@ def run(self):
         i = 0
         for repo in self.repos:
             url = repo[1]
-            u = urllib2.urlopen(url,context=ctx)
+            if ctx:
+                u = urllib2.urlopen(url,context=ctx)
+            else:
+                u = urllib2.urlopen(url)
             p = u.read()
             if sys.version_info.major >= 3 and isinstance(p, bytes):
                 p = p.decode("utf-8")
@@ -468,7 +474,10 @@ def run(self):
         self.info_label.emit("Downloading list of macros...")
         self.progressbar_show.emit(True)
         macropath = FreeCAD.ParamGet('User parameter:BaseApp/Preferences/Macro').GetString("MacroPath",os.path.join(FreeCAD.ConfigGet("UserAppData"),"Macro"))
-        u = urllib2.urlopen("https://www.freecadweb.org/wiki/Macros_recipes",context=ctx)
+        if ctx:
+            u = urllib2.urlopen("https://www.freecadweb.org/wiki/Macros_recipes",context=ctx)
+        else:
+            u = urllib2.urlopen("https://www.freecadweb.org/wiki/Macros_recipes")
         p = u.read()
         if sys.version_info.major >= 3 and isinstance(p, bytes):
             p = p.decode("utf-8")
@@ -510,7 +519,10 @@ def run(self):
         else:
             url = self.repos[self.idx][1]
             self.info_label.emit(translate("AddonsInstaller", "Retrieving info from ") + str(url))
-            u = urllib2.urlopen(url,context=ctx)
+            if ctx:
+                u = urllib2.urlopen(url,context=ctx)
+            else:
+                u = urllib2.urlopen(url)
             p = u.read()
             if sys.version_info.major >= 3 and isinstance(p, bytes):
                 p = p.decode("utf-8")
@@ -554,7 +566,10 @@ def run(self):
             mac = mac.replace("+","%2B")
             url = "https://www.freecadweb.org/wiki/Macro_"+mac
             self.info_label.emit("Retrieving info from " + str(url))
-            u = urllib2.urlopen(url,context=ctx)
+            if ctx:
+                u = urllib2.urlopen(url,context=ctx)
+            else:
+                u = urllib2.urlopen(url)
             p = u.read()
             if sys.version_info.major >= 3 and isinstance(p, bytes):
                 p = p.decode("utf-8")