Coverity: fix high impact issues

src/Main/MainCmd.cpp

@@ -138,8 +138,12 @@ int main( int argc, char ** argv )
     // Destruction phase ===========================================================
     Console().Log("FreeCAD terminating...\n");
 
-    // close open documents
-    App::GetApplication().closeAllDocuments();
+    try {
+        // close open documents
+        App::GetApplication().closeAllDocuments();
+    }
+    catch(...) {
+    }
 
     // cleans up
     Application::destruct();

src/Main/MainPy.cpp

@@ -118,6 +118,7 @@ extern "C"
         Dl_info info;
         int ret = dladdr((void*)initFreeCAD, &info);
         if ((ret == 0) || (!info.dli_fname)) {
+            free(argv);
             PyErr_SetString(PyExc_ImportError, "Cannot get path of the FreeCAD module!");
             return;
         }