Remove VmException from state

mythril/laser/ethereum/instructions.py

@@ -503,7 +503,6 @@ class Instruction:
             data = b''.join([util.get_concrete_int(i).to_bytes(1, byteorder='big')
                              for i in state.memory[index: index + length]])
 
-            # FIXME: broad exception catch
         except AttributeError:
 
             svar = str(state.memory[index])

mythril/laser/ethereum/state.py

@@ -2,7 +2,6 @@ from z3 import BitVec, BitVecVal
 from copy import copy, deepcopy
 from enum import Enum
 from random import randint
-from mythril.laser.ethereum.exceptions import VmException
 
 
 class CalldataType(Enum):
@@ -145,10 +144,7 @@ class MachineState:
         if self.memory_size > start + size:
             return
         m_extend = (start + size - self.memory_size)
-        try:
-            self.memory.extend(bytearray(m_extend))
-        except MemoryError:
-            raise VmException('error extending memory')
+        self.memory.extend(bytearray(m_extend))
         return True
         
     def memory_write(self, offset, data):