crash fixes

- viewing keyvalues for an entity with more than 64 fgd keys
- specific click combination when moving an ent for the first time
- selecting an entity in a map without VIS data with the debug widget open

src/bsp/Bsp.cpp

@@ -4448,6 +4448,10 @@ bool Bsp::is_leaf_visible(int ileaf, vec3 pos) {
 	bool isVisible = false;
 	int numVisible = 0;
 
+	if (!pvs) {
+		return true;
+	}
+
 	//logf("leaf %d can see:", ipvsLeaf);
 
 	for (int lf = 1; lf < leafCount; p++)

src/bsp/bsplimits.h

@@ -5,7 +5,7 @@
 #define MAXTEXTURENAME 16
 #define MIPLEVELS 4
 
-#define MAX_KEYS_PER_ENT 64 // just guessing
+#define MAX_KEYS_PER_ENT 256 // just guessing
 #define MAX_KEY_LEN 256 // not sure if this includes the null char
 #define MAX_VAL_LEN 4096 // not sure if this includes the null char
 

src/editor/Gui.cpp

@@ -2124,10 +2124,10 @@ void Gui::drawKeyvalueEditor_SmartEditTab(Entity* ent) {
 
 	if (fgdClass != NULL) {
 
-		static InputData inputData[128];
+		static InputData inputData[MAX_KEYS_PER_ENT];
 		static int lastPickCount = 0;
 
-		for (int i = 0; i < fgdClass->keyvalues.size() && i < 128; i++) {
+		for (int i = 0; i < fgdClass->keyvalues.size() && i < MAX_KEYS_PER_ENT; i++) {
 			KeyvalueDef& keyvalue = fgdClass->keyvalues[i];
 			string key = keyvalue.name;
 			if (key == "spawnflags") {

src/editor/Renderer.cpp

@@ -1001,7 +1001,7 @@ void Renderer::cameraPickingControls() {
 			draggingAxis = -1;
 			applyTransform();
 
-			if (pickInfo.valid && pickInfo.ent && undoEntityState->getOrigin() != pickInfo.ent->getOrigin()) {
+			if (pickInfo.valid && pickInfo.ent && undoEntityState && undoEntityState->getOrigin() != pickInfo.ent->getOrigin()) {
 				pushEntityUndoState("Move Entity");
 			}
 		}