Handle missing self.slither.solc_version

slither/detectors/attributes/const_functions_asm.py

@@ -50,7 +50,8 @@ All the calls to `get` revert, breaking Bob's smart contract execution.'''
             list: {'vuln', 'filename,'contract','func','#varsWritten'}
         """
         results = []
-        if self.slither.solc_version < "0.5.0":
+        if self.slither.solc_version and self.slither.solc_version >= "0.5.0":
+            return results
         for c in self.contracts:
             for f in c.functions:
                 if f.contract_declarer != c:

slither/detectors/attributes/const_functions_state.py

@@ -50,7 +50,8 @@ All the calls to `get` revert, breaking Bob's smart contract execution.'''
             list: {'vuln', 'filename,'contract','func','#varsWritten'}
         """
         results = []
-        if self.slither.solc_version < "0.5.0":
+        if self.slither.solc_version and self.slither.solc_version >= "0.5.0":
+            return results
         for c in self.contracts:
             for f in c.functions:
                 if f.contract_declarer != c: