fixing problems with Block reading/writing.

pykat/exceptions.py

@@ -26,5 +26,6 @@ class FinesseRunError(BasePyKatException) :
         self.__err = err
         self.__kat = kat
         
-        BasePyKatException.__init__(self, "Finesse returned an error running {1}: {0}".format(self.__err, self.__kat))
+        BasePyKatException.__init__(self, "Finesse error (file {1}):\n{0}".format(self.__err, self.__kat))
+        #BasePyKatException.__init__(self, "{0}".format(self.__err))
         

pykat/finesse.py

@@ -225,7 +225,7 @@ class kat(object):
                             warnings.warn("found block {0} before block {1} ended".format(newTag, self.__currentTag))    
                             
                         if newTag in self.__blocks:
-                            raise pkex.BasePyKatException("Block `{0}` has already been read")
+                            raise pkex.BasePyKatException("Block `{0}` has already been read").format(newTag)
                             
                         self.__blocks[newTag] = Block(newTag) # create new list to store all references to components in block
                         self.__currentTag = newTag                            
@@ -578,6 +578,7 @@ class kat(object):
         for key in self.__blocks:
             objs = self.__blocks[key].contents
 
+            if key != NO_BLOCK:
                 out.append("%%% FTblock " + key + "\n")
             
             for obj in objs:
@@ -594,6 +595,7 @@ class kat(object):
                         else:
                             out.append(txt + "\n")
 
+            if key != NO_BLOCK:
                 out.append("%%% FTend " + key + "\n")
         
         if self.noxaxis != None and self.noxaxis == True: