Fix a crash where analyzer binaries were absent

AnalyzerContext keeps track of the binaries for each analyzer. However,
if the binary isn't found, we don't map None to the respective analyzer,
we simply skip it. This lead to key errors when we called the version
getter function, which I fixed in this patch.

analyzer/codechecker_analyzer/analyzer_context.py

@@ -220,6 +220,7 @@ def __populate_analyzers(self):
                 if not compiler_binary:
                     LOG.debug("'%s' binary can not be found in your PATH!",
                               value)
+                    self.__analyzers[name] = None
                     continue
 
                 self.__analyzers[name] = os.path.realpath(compiler_binary)

analyzer/codechecker_analyzer/analyzers/clangsa/analyzer.py

@@ -172,6 +172,10 @@ def __add_plugin_load_flags(cls, analyzer_cmd: List[str]):
 
     @classmethod
     def get_binary_version(self, environ, details=False) -> str:
+        # No need to LOG here, we will emit a warning later anyway.
+        if not self.analyzer_binary():
+            return None
+
         if details:
             version = [self.analyzer_binary(), '--version']
         else:

analyzer/codechecker_analyzer/analyzers/clangtidy/analyzer.py

@@ -231,6 +231,10 @@ def analyzer_binary(cls):
 
     @classmethod
     def get_binary_version(self, environ, details=False) -> str:
+        # No need to LOG here, we will emit a warning later anyway.
+        if not self.analyzer_binary():
+            return None
+
         version = [self.analyzer_binary(), '--version']
         try:
             output = subprocess.check_output(version,

analyzer/codechecker_analyzer/analyzers/cppcheck/analyzer.py

@@ -85,6 +85,9 @@ def analyzer_binary(cls):
     @classmethod
     def get_binary_version(self, environ, details=False) -> str:
         """ Get analyzer version information. """
+        # No need to LOG here, we will emit a warning later anyway.
+        if not self.analyzer_binary():
+            return None
         version = [self.analyzer_binary(), '--version']
         try:
             output = subprocess.check_output(version,

analyzer/codechecker_analyzer/analyzers/gcc/analyzer.py

@@ -173,6 +173,9 @@ def get_binary_version(self, environ, details=False) -> str:
         """
         Return the analyzer version.
         """
+        # No need to LOG here, we will emit a warning later anyway.
+        if not self.analyzer_binary():
+            return None
         if details:
             version = [self.analyzer_binary(), '--version']
         else: