remove unnecessary 'try' block.

either exception is treated within mainFunction/stream, or it will kill the
parser, as it should

common/python/nomadcore/simple_parser.py

 from __future__ import division
 from future import standard_library
-from future.utils import raise_from
 standard_library.install_aliases()
 from builtins import str
 from builtins import range
@@ -1061,37 +1060,33 @@ class SimpleParser(object):
     def parseStep(self):
         if not self.context:
             return False
-        try:
-            currentContext = self.context[len(self.context) - 1]
-            if logger.isEnabledFor(logging.DEBUG):
-                logger.debug("lineNr: %d context: %s", self.fIn.lineNr,self.contextDesc())
-            if currentContext.startEnd == ParsingContext.Start:
-                nextI = currentContext.compiledMatcher.findNextMatch(self)
-            else:
-                nextI = currentContext.compiledMatcher.findNextMatchEnd(self)
-            logger.debug("lineNr: %d nextI: %d", self.fIn.lineNr, nextI)
-
-            if nextI < 0:
-                cNames = self.contextDesc()
-                while self.context:
-                    self.contextPop()
-                if nextI != -1 and nextI != -3:
-                    raise Exception("finished with error with parsing context %s" % (cNames))
+        currentContext = self.context[len(self.context) - 1]
+        if logger.isEnabledFor(logging.DEBUG):
+            logger.debug("lineNr: %d context: %s", self.fIn.lineNr,self.contextDesc())
+        if currentContext.startEnd == ParsingContext.Start:
+            nextI = currentContext.compiledMatcher.findNextMatch(self)
+        else:
+            nextI = currentContext.compiledMatcher.findNextMatchEnd(self)
+        logger.debug("lineNr: %d nextI: %d", self.fIn.lineNr, nextI)
+
+        if nextI < 0:
+            cNames = self.contextDesc()
+            while self.context:
+                self.contextPop()
+            if nextI != -1 and nextI != -3:
+                raise Exception("finished with error with parsing context %s" % (cNames))
+        else:
+            index = nextI // 2
+            startEnd = nextI % 2
+            matcherNew = self.parserBuilder.flatIndex[index]
+            self.goToMatcher(matcherNew, startEnd)
+            logger.debug("new context: %s\n", self.contextDesc())
+            currentCtx = self.context[len(self.context) - 1]
+            if startEnd == ParsingContext.End:
+                self.lastMatch = currentCtx.compiledMatcher.handleEndMatch(self)
+                self.contextClose(currentCtx)
             else:
-                index = nextI // 2
-                startEnd = nextI % 2
-                matcherNew = self.parserBuilder.flatIndex[index]
-                self.goToMatcher(matcherNew, startEnd)
-                logger.debug("new context: %s\n", self.contextDesc())
-                currentCtx = self.context[len(self.context) - 1]
-                if startEnd == ParsingContext.End:
-                    self.lastMatch = currentCtx.compiledMatcher.handleEndMatch(self)
-                    self.contextClose(currentCtx)
-                else:
-                    self.lastMatch = currentCtx.compiledMatcher.handleStartMatch(self)
-        except Exception as e:
-            origin = traceback.format_exc()
-            raise_from(Exception("Failure, context %s, line %d coming from %s"%(self.contextDesc(), self.fIn.lineNr, origin)), e)
+                self.lastMatch = currentCtx.compiledMatcher.handleStartMatch(self)
         return len(self.context) > 0
 
     def parse(self):