Handle null "DisplayName" in registry

This is a backport of 0dabaa1
from PR #331

Fixes #330

Author: jonahgraham

build/org.eclipse.cdt.build.gcc.core/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.cdt.build.gcc.core;singleton:=true
-Bundle-Version: 2.1.0.qualifier
+Bundle-Version: 2.1.1.qualifier
 Bundle-Activator: org.eclipse.cdt.build.gcc.core.internal.Activator
 Bundle-Vendor: %providerName
 Require-Bundle: org.eclipse.core.runtime,

build/org.eclipse.cdt.build.gcc.core/src/org/eclipse/cdt/build/gcc/core/internal/Msys2ToolChainProvider.java

@@ -48,6 +48,9 @@ public void init(IToolChainManager manager) {
 			for (int i = 0; (subkey = registry.getCurrentUserKeyName(uninstallKey, i)) != null; i++) {
 				String compKey = uninstallKey + '\\' + subkey;
 				String displayName = registry.getCurrentUserValue(compKey, "DisplayName"); //$NON-NLS-1$
+				if (displayName == null) {
+					continue;
+				}
 				if (on64bit) {
 					if (MSYS2_64BIT_NAMES.contains(displayName)) {
 						if (addToolChain64(manager, registry, compKey)) {

core/org.eclipse.cdt.core/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.cdt.core; singleton:=true
-Bundle-Version: 8.1.0.qualifier
+Bundle-Version: 8.1.1.qualifier
 Bundle-Activator: org.eclipse.cdt.core.CCorePlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/internal/core/MinGW.java

@@ -95,6 +95,9 @@ private static String findMinGWRoot(String envPathValue, String envMinGWHomeValu
 			for (int i = 0; (subkey = registry.getCurrentUserKeyName(uninstallKey, i)) != null; i++) {
 				String compKey = uninstallKey + '\\' + subkey;
 				String displayName = registry.getCurrentUserValue(compKey, "DisplayName"); //$NON-NLS-1$
+				if (displayName == null) {
+					continue;
+				}
 				if (on64bit) {
 					if (MSYS2_64BIT_NAMES.contains(displayName)) {
 						String installLocation = registry.getCurrentUserValue(compKey, "InstallLocation"); //$NON-NLS-1$
@@ -230,6 +233,9 @@ private static String findMSysRoot(String envMinGWHomeValue) {
 			for (int i = 0; (subkey = registry.getCurrentUserKeyName(uninstallKey, i)) != null; i++) {
 				String compKey = uninstallKey + '\\' + subkey;
 				String displayName = registry.getCurrentUserValue(compKey, "DisplayName"); //$NON-NLS-1$
+				if (displayName == null) {
+					continue;
+				}
 				if (on64bit) {
 					if (MSYS2_64BIT_NAMES.contains(displayName)) {
 						String home = registry.getCurrentUserValue(compKey, "InstallLocation"); //$NON-NLS-1$