Prevent crash if Chase/Cycle custom pattern is selected but pattern is empty

Author: dkulp

src/channeltester/RGBChase.cpp

@@ -67,7 +67,7 @@ int TestPatternRGBChase::SetupTest(void) {
     }
 
     // Make sure we have a valid set of triplets
-    while (m_colorPattern.size() % 3)
+    while (m_colorPattern.size() < 3 || m_colorPattern.size() % 3)
         m_colorPattern.push_back(0);
 
     char* c = m_testData;

src/channeltester/RGBCycle.cpp

@@ -64,7 +64,7 @@ int TestPatternRGBCycle::SetupTest(void) {
     }
 
     // Make sure we have a valid set of triplets
-    while (m_colorPattern.size() % 3) {
+    while (m_colorPattern.size() < 3 || m_colorPattern.size() % 3) {
         m_colorPattern.push_back(0);
     }