Ensure SDL font list has at least one font

Author: benstone

kauai/src/fontsdl.cpp

@@ -247,10 +247,17 @@ bool NTL::FInit(void)
         goto LFail;
 
     // Load fonts
-    fRet = _FLoadFontTable();
+    if (!_FLoadFontTable())
+        goto LFail;
+
     Assert(_pgst->IvMac() > 0, "No fonts loaded");
     Assert(_onnSystem != 0, "System font number not set");
 
+    if (_pgst->IvMac() == 0)
+        goto LFail;
+
+    fRet = fTrue;
+
 LFail:
     if (!fRet)
         PushErc(ercGfxNoFontList);