get sure decode doesnt break

src/fenrirscreenreader/screenDriver/vcsaDriver.py

@@ -287,6 +287,12 @@ class driver(screenDriver):
                     lineAttrib.append(charAttrib)
                     lineText += ' '
                     continue
+                blink = 0
+                bold = 0
+                ink = 7
+                paper = 0
+                ch = 32
+                try:
                     (sh,) = unpack("=H", data)
                     attr = (sh >> 8) & 0xFF
                     ch = sh & 0xFF
@@ -294,7 +300,6 @@ class driver(screenDriver):
                         attr >>= 1
                     ink = attr & 0x0F
                     paper = (attr>>4) & 0x0F
-                blink = 0
                     if attr & 1: 
                         blink = 1
                     # blink seems to be set always, ignore for now
@@ -306,10 +311,13 @@ class driver(screenDriver):
                     #    print(ink,paper)
                     if sh & self.hichar:
                         ch |= 0x100
+                except:
+                    pass
                 try:
                     lineText += self.charmap[ch]
                 except KeyError:
                     lineText += '?'
+
                 charAttrib = [
                 self.fgColorValues[ink],
                 self.bgColorValues[paper],