fix: guard against empty string crash in parser() and bounds check in read_FM/read_SM

Author: avinxshKD

concore.hpp

@@ -240,6 +240,7 @@ class Concore{
      */
     vector<double> parser(string f){
         vector<double> temp;
+        if(f.empty()) return temp;
         string value = "";
 
         //Changing last bracket to comma to use comma as a delimiter
@@ -330,6 +331,10 @@ class Concore{
         s += ins;
 
         vector<double> inval = parser(ins);
+        if(inval.empty())
+            inval = parser(initstr);
+        if(inval.empty())
+            return inval;
         simtime = simtime > inval[0] ? simtime : inval[0];
 
         //returning a string with data excluding simtime
@@ -389,6 +394,10 @@ class Concore{
         s += ins;
 
         vector<double> inval = parser(ins);
+        if(inval.empty())
+            inval = parser(initstr);
+        if(inval.empty())
+            return inval;
         simtime = simtime > inval[0] ? simtime : inval[0];
 
         //returning a string with data excluding simtime